← Back to Blog · 2026-09-23 · 7 min read · Trading Education

It's 8:55 a.m. in Shanghai. You're flat, coffee in hand, watching the rebar open. The night session closed at 3,420. SGX iron ore swaps were up 2.4% overnight, and LME copper pushed higher after you went to bed. The 9:00 a.m. open prints 3,475 — a 55-point gap on a contract where your entire stop was 30 points. You weren't wrong on direction. You were wrong about what "overnight" means in Chinese commodity futures.

If you trade China futures from anywhere in the world, this is the single biggest source of drawdown you'll face that doesn't exist in the same way in US or European markets. The good news: gap risk here is structural, which means it's measurable, and you can build rules around it. Let's break down how.

Why Chinese Commodity Futures Gap Differently

Most Chinese commodity contracts trade a day session (roughly 9:00–15:00 with breaks) and a night session (typically 21:00 to 23:00, 01:00, or 02:30 depending on the contract). Here's the trap: the night session closes hours before the day session opens. Everything that happens globally between night session close and 9:00 a.m. Beijing time gets compressed into the day open.

For industrial commodities, the overnight drivers are specific and trackable:

• Iron ore: Singapore Exchange (SGX) iron ore swaps trade nearly around the clock. The DCE iron ore open in the morning is essentially repricing against SGX.
• Copper and other metals: LME runs almost 24 hours. SHFE copper opens against whatever LME did overnight.
• Crude oil and energy: INE crude opens against WTI and Brent, which trade through the Asian night.

Add two structural amplifiers. First, weekends and holidays: Chinese markets are closed Saturday and Sunday, and holidays like Golden Week and Spring Festival shut the market for up to a week while the rest of the world keeps trading. Monday opens — and post-holiday opens — can gap multiples of a normal daily range. Second, exchange intervention: Chinese exchanges actively manage volatility by raising margins and widening price limits during hot markets, which changes your risk parameters mid-position if you're not watching.

Know Your Contract Specs Before You Size Anything

You cannot control drawdown on a contract you haven't fully priced. These are the specs that matter most for gap math:

Notice the leverage asymmetry. One lot of rebar at roughly 3,000+ yuan/ton controls about 30,000+ yuan of notional. One lot of crude oil at even a modest oil price controls well over 400,000 yuan of notional. A 1% overnight gap on crude is a very different dollar event than a 1% gap on rebar. When you trade rebar or iron ore, you're in the more forgiving end of the spectrum; when you trade INE crude, gap risk is institutional-grade and most retail traders should simply not hold it through closes.

Rule 1: Size for the Gap, Not for the Stop

Standard position sizing says: risk = (entry − stop) × contract multiplier × lots. That formula assumes your stop gets filled at your stop. In a gapping market, it doesn't. Your fill happens at the open, wherever the open is.

So build a gap buffer into every position:

• Estimate a realistic adverse gap for the contract. For actively traded industrial contracts on normal days, overnight gaps of 0.5–1% happen regularly; on Mondays and after holidays, plan for 2% or worse.
• Your true risk per lot = (planned stop distance + gap buffer) × multiplier.
• Then apply your fixed fractional rule — say 1% of account per trade — to that inflated number, not the raw stop distance.

Example with iron ore: 100 tons per lot, entry around 800 yuan/ton, a 10-yuan stop, and a 1% gap buffer (8 yuan). True risk per lot is 18 yuan/ton × 100 = 1,800 yuan, not 1,000. On a $10,000 account risking 1%, that difference alone cuts your size nearly in half. That's the point. The buffer is what keeps a single ugly open from turning into a 5% account hit.

Rule 2: Treat the Steel Chain as One Position

Drawdown control isn't just per-trade — it's portfolio-level. Chinese industrial commodities are heavily correlated within chains: rebar, hot-rolled coil, and iron ore effectively move together because they're one production pipeline. Coking coal, coke, and thermal coal correlate with the broader energy-and-construction complex.

If you're long rebar, long iron ore, and long coke, you don't have three trades. You have one big bet on Chinese industrial demand with three times the exposure. When the complex gaps against you — and it tends to gap together, because the overnight driver (SGX, macro headlines, policy news) hits all of them at once — your drawdown is the sum, not the average.

Practical rule: cap total exposure per correlated chain. Treat the entire steel chain as a single risk unit. If your normal max is 3% portfolio heat, the whole chain gets 3%, not 3% per contract. This one rule has saved more accounts from overnight disasters than any stop-loss tweak ever will.

Rule 3: Respect the Calendar — Especially Chinese Holidays

Put this on your wall: the most dangerous holds in Chinese commodity futures are weekend holds and pre-holiday holds. A normal weeknight gap might cost you your stop plus buffer. A holiday gap can blow through several stops' worth of price in one print.

The 2021 thermal coal rally is the canonical case study. Coal prices surged through the autumn of 2021 on supply shortages, and the exchange responded by repeatedly raising margins and widening price limits. Then policy intervention flipped the market, and prices collapsed violently — with traders caught on both sides hitting expanded limit moves where exiting at all was difficult. Anyone holding through that period with normal sizing learned that "risk per trade" is not a constant; the exchange can change the game's parameters overnight.

Similarly, the 2020 oil crash showed what happens when a globally traded commodity gaps beyond every model's assumption — and INE crude traders felt it in a contract with a 1,000-barrel multiplier.

Practical rules:

• Reduce size or go flat before long closures (Golden Week, Spring Festival). The opportunity cost of missing a move is nothing compared to an un-hedgeable gap.
• Halve your size for Monday opens if you hold through weekends at all.
• Track exchange margin and limit changes — they're public announcements, and they're telling you exactly where the exchange thinks the risk is.

Rule 4: Use the Night Session as Your Pressure Valve

Here's something many overseas traders miss: if the driver of your gap risk is global overnight movement, the night session is partially your hedge. Iron ore, rebar, copper, crude, and soybean meal all have night sessions precisely so the market can digest international prices in real time.

Two ways to use this:

• Enter during the night session when SGX or LME confirms your setup, so you're not buying blind at the 9:00 open.
• Exit or trim before night session close on positions where the overnight window (roughly 23:00/01:00/02:30 to 9:00) contains a known event — a US CPI print, an OPEC meeting, a Fed decision. If you can't hold the position through the event with your gap-adjusted size, you can't hold the position.

One caveat: night session liquidity is thinner than the day session, especially in the final hour. Don't assume you can exit a full position at the 02:30 close without slippage. Trim early, in size, while the book is still deep.

Rule 5: Build a Circuit Breaker Before You Need It

Gap losses cluster. The trader who takes a bad Monday gap usually takes a second bad trade trying to "win it back" by Tuesday — often with doubled size. That's how a 3% drawdown becomes 15%.

Institutionalize your circuit breakers in advance:

• Daily loss limit: stop trading for the day at −2% of account. Non-negotiable, including gap losses you didn't control.
• Weekly loss limit: at −5% on the week, cut size in half until you're back to flat.
• Gap-event rule: after any fill materially worse than your stop (a true gap through), take the rest of the session off. Your read of the market is stale the moment the open prints against you.

Also decide your open routine in advance: most experienced traders don't chase the 9:00 print. Let the first 15 minutes establish a range, then act. The open is where gap sellers and gap buyers are most emotional; the first 15-minute candle is usually a fairer picture.

Putting It Together: A Gap-Safe Daily Checklist

• Check the economic calendar for overnight events before holding any position past a close.
• Check SGX iron ore / LME metals / WTI-Brent levels against SHFE/DCE/INE closes to estimate likely morning gaps.
• Verify current margin rates and price limits on your contracts — they change during volatile periods.
• Size with the gap buffer included, not just the stop.
• Sum your correlated exposure across the steel or coal chain and cap it as one unit.
• Confirm your daily and weekly loss limits are armed before the first trade.

None of this eliminates gap risk — nothing does. What it does is convert an account-killing surprise into a budgeted, survivable cost of trading Chinese commodity futures. That's the entire game of drawdown control: not avoiding losses, but making sure no single open can take more than its allotted share.

And because gap behavior is so specific to Chinese market hours and exchange rules, the only way to know whether your rules actually hold is to run them against real China futures data — real gaps, real limits, real session times. That's exactly what we built XS Select for: a China futures trader evaluation where you can test your drawdown framework on live-market conditions starting from $29. If your system survives a Chinese Monday open, it can survive anything.