01 · Day Trading in Practice
Day trading (Intraday Trading): open and close positions within the same day, holding no position overnight. T+0 venues include: domestic futures, crypto perpetuals and spot, US stocks, and intraday round-trips on an A-share existing holding (using a base position to sell high and buy low under the T+1 regime).
Day trading is the style with the lowest entry barrier and the highest attrition rate — anyone with an account can do it, but the No. 1 reason 90% of day traders lose is not poor technique: they never ran the numbers on fees and slippage. This article runs the numbers first, then covers the methods.
1. The Survival Threshold: Settle the Fee and Slippage Math First
1.1 Where the costs come from
| Cost item | Description | Typical magnitude (historical common levels; defer to actual rates) |
|---|---|---|
| Commission | Charged once on entry, once on exit | Futures about 0.01%-0.05% per side; crypto maker often as low as 0.02% |
| Slippage | Buy price above the quote, sell price below the quote | 0.01%-0.1% per side; higher for instruments with poor liquidity |
| Market impact | Large orders push the price | The bigger the order, the costlier; usually negligible for retail |
| Cost of capital | Overnight interest / funding rate | Day trading holds no overnight position, so this ≈ 0 |
Key insight: fees and slippage are charged on notional value, regardless of whether you profit. Every 100,000-CNY trade you make pays out a fixed amount up front; how large this becomes over a year is calculated directly below.
1.2 Numerical walkthrough: 20 trades a day at 0.05% per side — how much capital does a year burn
Assume 100,000 CNY of capital, fully deployed per trade (100,000 CNY notional per trade), one complete round-trip (open + close) each time:
| Parameter | Value |
|---|---|
| One-way fee | 0.05% |
| Cost per round-trip (open + close) | 0.05% × 2 = 0.10% |
| Trades per day | 20 round-trips |
| Daily cost (of notional) | 0.10% × 20 = 2.0% |
| Trading days per year | 250 |
| Annual cost (of notional) | 2.0% × 250 = 500% |
| Applied to 100,000 CNY capital | 500,000 CNY per year |
💀 The hidden killer of day trading: fees
At 20 trades a day and 0.05% per side, annual fees equal 5 times your capital. You would need to average 2% gross notional profit per day for 250 days a year just to break even — this is not a "try a bit harder" situation; it is mathematically almost impossible to do consistently.
Now the sensitivity across parameter combinations:
| Trades per day | Total cost per side (fees + slippage) | Annual cost (of notional) | Equivalent to (on 100,000 CNY capital) |
|---|---|---|---|
| 5 | 0.10% | 250% | 250,000 CNY |
| 10 | 0.05% | 250% | 250,000 CNY |
| 20 | 0.05% | 500% | 500,000 CNY |
| 20 | 0.025% (institutional tier) | 250% | 250,000 CNY |
| 50 (scalping) | 0.05% | 1250% | 1,250,000 CNY |
The above is a walkthrough at historically common fee levels and does not represent the current rates of any specific broker/exchange — defer to actual rates. But the order-of-magnitude conclusion stands: the more frequently you trade, the deadlier the costs.
1.3 Three iron rules for day trading survival
- Choose a low-fee venue. Check before trading: for futures pick a discounted commission tier; for crypto place limit orders as maker (often less than half the taker fee); for US stocks note zero-commission brokers but watch payment for order flow and the spread.
- Write costs into your trading rules. Target a risk-reward of at least 1.5:1 per trade, net of round-trip costs — a trade with 0.3% expected gross profit has only 0.2% left after 0.1% costs, not worth taking.
- Control frequency. Day trading does not reward trading "a lot"; it rewards trading "well". Three to five high-quality trades a day beat 20 frantic high-frequency shots over the long run.
⚠️ Day trading rewards doing it right, not doing it often
Day trading does not reward "doing more"; it rewards "doing it right". Three to five high-quality trades a day beat 20 frantic high-frequency shots over the long run. Target a risk-reward of at least 1.5:1 per trade, net of round-trip costs — a trade with 0.3% expected gross profit has only 0.2% left after 0.1% costs, not worth taking.
2. Instrument Traits That Suit Day Trading
Not every instrument suits day trading. Survival conditions: enough volatility (meat to eat), enough liquidity (affordable to trade), enough trading hours (you can watch it).
| Trait | Why it matters | Passing bar (historical statistics; defer to actual conditions) |
|---|---|---|
| Volatility | Intraday moves must cover costs | Daily range ≥ 2 round-trip costs, i.e. ≥ 0.4% to start; trending instruments often reach 1%-3% |
| Liquidity | Low slippage, easy in and out | Deep order book, narrow bid-ask spread, instant fills |
| Trading hours | The hours you can actually watch | Your waking hours must cover the instrument's main active session |
| Volatility rhythm | Has "active windows" to focus on | Clear high-volume windows (e.g. the first hour after the open, the Europe/US overlap) |
| Familiarity | Do not trade what you do not know | Only trade 1-2 instruments whose history you have studied |
Quick reference: day trading traits by market
| Market | Active hours (Beijing time, historical pattern) | Day trading traits |
|---|---|---|
| Domestic futures | 09:00-15:00 + night session 21:00-02:30 | Heavy volatility at open/close, price limits and fee discounts (different rates for closing today's positions) |
| Crypto | 24 hours | Europe/US hours (20:00-02:00 next day) are volatile; pre-dawn liquidity is poor with high slippage |
| US stocks | 21:30-04:00 | Big moves in the first 30 minutes and near the close; frequent gaps during earnings season |
| A-shares | 09:30-11:30 / 13:00-15:00 | T+1 restriction — only round-trips on a base holding or holding logic; ±10% price limits |
3. Patterns of the First 30 Minutes (A-Shares / Futures as Examples)
3.1 Statistical traits (historical statistics, not predictive; defer to actual conditions)
| Phenomenon | Historical statistical trait | Common cause |
|---|---|---|
| Gap up, then fade | Stocks/instruments gapping up over 1% have a high probability of pulling back within the first 30 minutes | Overnight bullish news front-run and cashed in, concentrated selling |
| Gap down, then rally | Gaps down over 1% but surges on volume after the open | Panic selling absorbed by institutions, short covering |
| Gap up and hold | Holds above the open gap within 15 minutes with expanding volume | Genuine strength, often the day's trend direction |
| Flat open, narrow range | Low-volume sideways drift in the first 30 minutes | Direction undecided; entries here have a win rate near random |
Note: these are probabilistic tendencies, not ironclad rules. "Gap up, then fade" is merely "more likely", not grounds for a heavy counter-position. Use it as a reason to be cautious during the opening phase, not as a signal to short the open.
3.2 How to avoid chasing the open chaotically
The first 30 minutes are where retail traders bleed most. Three rules:
- No orders in the first 5 minutes. The first momentum spike/dive after the auction is often unsustainable — wait for the first 5-minute candle to set.
- Do not chase instant pulses over 2%. A vertical 2%+ spike at the open is either real (it will pull back and give you a chance) or a bull trap (chase in and you are the bagholder). Wait for a pullback that holds the session VWAP.
- Only chase gap-up-and-hold; never bottom-fish gap-up-and-fade. The precondition for buying "gap down, then rally" is seeing volume-backed absorption (price stabilizing on the intraday chart with rising volume), not merely seeing a lower open.
4. Common Day Trading Methods (Pick One, Master It)
4.1 Prior high/low breakout
- Logic: price breaks the high/low of the last 20-30 five-minute candles, taken as trend continuation.
- Entry: enter on a break of the prior high (or prior low); confirm with volume (volume breakouts have a higher win rate, per historical statistics).
- Stop-loss: 1.5 × ATR on the other side of the breakout point (or beyond the breakout candle's high/low).
- Best for: instruments with clear highs/lows; all false breakouts in range markets — do not use.
4.2 Opening Range Breakout (ORB)
- Logic: the first 15-30 minutes form the "opening range" (high − low); a break of the range boundary is taken as the day's direction.
- Steps:
- No trading for the first 30 minutes; only mark the range high H and low L;
- Volume-backed break above H → go long; break below L → go short (historical statistics: ORB breakouts win more on trend days than range days, but on most days the range is never broken);
- Stop-loss on the other side of the range (H-to-L is usually wide enough; size the position accordingly);
- Flat before the close (e.g. the last 30 minutes) if the target is not reached — no overnight holds in day trading.
- Caution: if the range is too narrow (< 1 ATR), most breakouts are noise — wait for a wider range or skip the day.
4.3 Mean reversion to the moving average
- Logic: after price spikes/dives far from the moving average (e.g. beyond 2 standard deviations from the 20 MA on the 5-minute chart), it reverts to the mean.
- Entry: enter counter-trend when a stalling candle prints after a fast deviation (long upper wick, bearish engulfing).
- Stop-loss: a fixed distance beyond the deviation extreme (e.g. 0.5% or 1 ATR).
- Best for: narrow ranges and brief overbought/oversold stretches mid-trend; forbidden in strong one-sided trends (strength can keep deviating).
4.4 Reversal at key intraday levels
- Logic: reverse when an intraday key level fails (prior settlement, prior day's high/low, round numbers, session VWAP).
- Typical setups: price breaks the prior day's low, bounces weakly, then breaks it again → short with the trend; price hits a round number and is caught on heavy volume → go long.
- Stop-loss: the failed-reversal point (a short distance on the other side of the key level).
- Discipline: reversing requires a structural break (a clear key level broken with volume confirmation), not "it feels like it has fallen enough".
5. Intraday Stop-Loss Discipline (The Lifeline of Day Trading)
An intraday stop-loss is not "part of the strategy" — it is the precondition for still having money to trade tomorrow. Four hard rules:
| Rule | Suggested value (adjust to your risk tolerance) | Notes |
|---|---|---|
| Per-trade loss cap | ≤ 0.5%-1% of total capital | Stricter than swing: fast decisions, less room for error |
| Daily loss cap | ≤ 2%-3% of total capital | When triggered, shut down for the day; no revenge trading |
| Trade count cap | 3-5 per day (except high-frequency) | Stop at the cap, win or lose |
| Time stop | No profit after 2 hours → exit | Do not drag intraday trades into overnight holds, and do not let dead money occupy the position |
The time stop is a weapon unique to day trading: if the direction is right, the market rewards you quickly; if you are still grinding near breakeven after 2 hours, your call is probably wrong — get out and watch first.
💀 Per-trade loss ≤ 0.5%-1%, daily loss ≤ 2%-3%, shut down when triggered
Per-trade loss ≤ 0.5%-1% of total capital, daily loss ≤ 2%-3% of total capital — when triggered, shut down for the day; no revenge trading. Day trading decisions are fast and room for error is small. Any averaging-down add that exceeds the daily loss cap upgrades an "intraday loss" into an "overnight liquidation".
6. The Day Trading Review Template (10 Minutes After the Close)
The purpose of the review template: record for every trade "why in, why out, how much won or lost, and what emotion at the time". All four columns are indispensable; the emotion column is the most often skipped and the most important.
## Daily Review (Date: ____)
| Time | Instrument/Direction | Why in (trigger) | Why out (rule/emotion) | Entry | Exit | P&L | Emotion (fear/greed/calm) | Rule violated? |
|---|---|---|---|---|---|---|---|---|
| 09:45 | Rebar/Long | Prior-high breakout + volume | No profit in 2 hours, time stop | 4100 | 4085 | -15 pts | Anxious | No |
| 13:30 | BTC/Short | Broke opening range | Stop hit at range top | 66500 | 66700 | -200 | Reluctant | No |
| 14:10 | Apple/Long | MA reversion + long lower wick | Target 1.5R hit | 9.20 | 9.32 | +1.2% | Calm | No |Then aggregate once a week:
- This week's trade count, win rate, average P&L, total P&L vs total fees (costs must be listed separately);
- How many rule-violating trades? What emotions accompanied them?
- Which methods made money and which lost → cut the losing methods, even if they only lost twice.
Sample-size reminder: statistics on fewer than 30 trades are meaningless. Do not kill a method based on 5 trades, and do not size up based on 5 winners.
7. Common Ways Day Traders Die
| Way to die | Typical script | Antidote |
|---|---|---|
| Death by costs | 20 high-frequency trades a day, 5× capital in annual fees | Run the numbers first (see Part 1), cut frequency and fees |
| Chasing the open | Chasing a 2% spike at the open, buying the top | No orders in the first 5 minutes; wait for the pullback |
| Averaging down | Adding to losers to lower the average, digging deeper | Exit the moment the per-trade stop triggers; averaging down is forbidden intraday |
| Counter-trend bottom-fishing | "It has fallen enough" after a 3% drop | Only structural signals (key level + volume), never feelings |
| Small wins, big losses | Take +0.2% quickly, hold losers to -2% | Enter only at risk-reward ≥ 1.5:1; cap losses with stops |
| Dragged into overnight | Should have closed but held overnight | Time stop + forced flat before the close |
| Revenge mindset | Doubling size after a -3% day to win it back | Daily loss cap triggers → shut down |
| Emotional serial trading | Random firing after 3 straight losses | After 3 straight losses, force a 30-minute break; consider stopping for the day |
| Ignoring trading hours | Trading illiquid instruments at dawn, slippage eats the profit | Trade only your instrument's active hours |
| No review | Trading on feel daily, never knowing what went wrong | 10 minutes after the close, log per the Part 6 template |
8. A Day Trader's Daily Routine (Action Checklist)
08:50 Review overnight overseas markets and news; mark today's key levels (prior settlement/prior day's high/low/round numbers)
09:00 Open: no orders for the first 5 minutes; mark the opening range (ORB prep)
09:30 Trade only the top-priority method (e.g. ORB breakout / prior high-low); before every entry, run the four questions:
Basis for direction? Stop level? Risk-reward ≥ 1.5? Size ≤ 1% risk? — if unanswered, skip
11:30 Morning close: quickly log morning positions and mindset
13:00 Afternoon session: same routine; fewer new entries late in the day (insufficient time-stop room near the close)
15:00 Close: forcibly flatten all intraday positions (except A-share base-position round-trips)
15:10 Review per the Part 6 template and write the journal⚠️ Risk Warning
Day trading has the highest fee and slippage drag and the strictest execution-discipline requirements of any style. All statistical traits above (opening patterns, breakout win rates, fee levels) are historical statistics, not predictive; defer to actual market conditions and each platform's real-time rules. If you remain net-negative after costs for several consecutive weeks, stop live trading and return to a demo account to rebuild. Participate only with money you can afford to lose, and never use leverage to amplify intraday losses.