← Back to Blog · 2026-10-07 · 9 min read · Challenge Guide

You've been patient all morning. Rebase your bias, wait for the setup, and finally pull the trigger on iron ore. The trade works — for about twenty minutes. Then a headline crosses the wire, the tape turns violent, and before you can even think about managing it, you're down more in one session than you'd normally risk in a week. On most prop platforms, that single session just ended your evaluation.

This is the specific pain of trading Chinese commodity futures: the market moves fast, leverage is built into the margin system, and evaluations enforce a hard daily loss cap — commonly 2% of the starting balance. Blow through it, and there's no "I'll make it back tomorrow." You're done for the day, and depending on the rules, possibly done for the challenge.

The good news: the 2% cap isn't a trap. It's a design constraint, and like any constraint, you can build a position sizing framework around it that keeps you alive long enough for your edge to show up. Here's how.

Why the 2% Cap Hits Harder in China Futures

If you're coming from US or European index futures, the first thing you notice about Chinese commodity futures is the volatility profile. These are not sleepy markets. Iron ore, rebar, methanol, thermal coal — these products routinely produce multi-percent intraday swings on ordinary days, and during policy-driven regimes they can go vertical.

Two well-known examples illustrate the point. In 2021, thermal coal on the Zhengzhou exchange went through one of the most explosive rallies in commodity history — prices roughly tripled in a matter of months before regulators stepped in and the market collapsed almost as fast as it had risen. Traders who were correctly positioned on the way up got annihilated on the way down if they sized aggressively. Similarly, anyone who traded crude oil in April 2020 — even the Chinese INE crude contract, which hit its own limit moves around that period — learned that tail risk in commodities is not theoretical.

Now layer the evaluation structure on top. A 2% daily loss cap means that on a $50,000 account, your entire day is worth $1,000. Not per trade — per day. Every contract you carry, every gap you absorb, every slippage event comes out of that single budget. The traders who fail these evaluations don't usually fail because they lack a strategy. They fail because they sized positions as if the cap didn't exist, took two or three overlapping risks, and let one bad tape eat the whole day.

The cap doesn't punish losing. It punishes losing big. Your entire job as a position sizer is to make "big" structurally impossible.

Know Your Contract Specs Before You Size Anything

You cannot size positions in Chinese commodity futures with vague notions of "risk per lot." Every product has its own tick size, contract multiplier, and exchange — and the risk per tick varies enormously. Here are the specs you'll actually use, for some of the most liquid products:

(CNY-to-USD conversions are approximate and move with the exchange rate — always recompute at current rates.)

Notice the asymmetry. One lot of rebar risks about $1.40 per tick. One lot of INE crude risks roughly ten times that. If you treat "one lot" as a standardized unit across products, you're not position sizing — you're randomly assigning risk. A hard rule: convert every intended stop distance into dollar risk per contract before you ever look at how many lots feel right.

Also note that margin in China is a percentage of notional value, and exchanges periodically adjust these percentages — sometimes dramatically, exactly when volatility spikes. Your broker's effective margin will be higher than the exchange minimum. Build your sizing on your actual, current margin requirement, not last month's.

Build a Three-Tier Daily Budget, Not a Single Number

The biggest mistake traders make with a 2% cap is treating it as the stop. If your daily loss limit is $1,000 and your first trade risks $900, one normal stop-out puts you one slippage event away from elimination. The cap is the wall — your actual risk budget needs to sit well inside it.

A structure that works well:

• Tier 1 — Per-trade risk: 0.5% of the account ($250 on $50k). This is your standard unit. Any single idea, no matter how confident you feel, risks half a percent.
• Tier 2 — Soft daily stop: 1.2% ($600). When your cumulative realized plus open losses hit this line, you cut size in half for the rest of the session. You're allowed to keep trading, but the market has told you something about today's conditions.
• Tier 3 — Hard daily stop: 1.5% ($750). Platform closed. Journal, walk away. The remaining 0.5% between your hard stop and the 2% cap is pure buffer — reserved for gaps, slippage, and the stop order that fills three ticks through your level.

Why not simply risk 2% across two trades of 1% each? Because consecutive losses cluster. Losing trades tend to arrive in the same session, in the same conditions — chop after a news event, a failed breakout regime. A tiered budget forces de-risking exactly when your read on the market is most likely wrong, which is the whole point.

Count open risk, not just realized losses

Here's the detail that separates survivors from casualties: your daily budget is consumed by open risk too. If you're down $300 realized and you enter a new trade with a $250 stop, your worst-case day is now $550 — Tier 2 territory before the trade even develops. Every position you carry must be logged against the daily budget the moment it's opened. If you can't fit the full stop distance inside your remaining budget, you size down or you skip.

The Position Sizing Math: Fixed Fractional, Adjusted for Volatility

Once the budget exists, sizing each trade is simple arithmetic — but the input that matters is volatility, not conviction.

The core formula:

Lots = (Risk Budget in CNY) ÷ (Stop Distance in Ticks × Value per Tick)

Example: you're trading iron ore on a $50,000 account with a 0.5% per-trade risk ($250, roughly 1,800 CNY at typical rates). Your setup puts the stop 30 ticks away. At 50 CNY per tick, that's 1,500 CNY of risk per lot — so you trade one lot. If your stop were only 15 ticks, the formula says two lots. Same dollar risk, different contract count. That's the entire discipline: contract count is an output of the math, never an input.

But fixed dollar risk alone has a flaw in Chinese commodity futures: volatility regimes shift hard. A 30-tick stop on iron ore might be noise in a trending month and generous in a quiet one. Two refinements:

• ATR-based stops. Set your stop distance as a multiple of recent average true range — for example, 1 to 1.5× the 14-period ATR on your trading timeframe. When volatility expands, your stop widens, and the formula automatically hands you fewer lots. When volatility compresses, you get more size for the same risk. You never have to guess whether the market is "hot."
• Volatility filter. If today's range in the first hour is already, say, more than 1.5× the recent daily ATR, the market is in an abnormal regime — policy headlines, limit-move conditions, whatever it is. Either halve your normal risk unit or stand aside. The thermal coal episode of 2021 is the canonical case: traders who kept using normal sizing in an abnormal tape didn't experience a bad day; they experienced an account-ending one.

Respect the Rhythm of the Chinese Trading Day

Position sizing in China futures isn't just about contracts — it's about when you carry them. The Chinese market structure has sessions that matter for risk:

• The midday break. Most Chinese futures markets trade a morning session, close around 11:30, reopen at 13:30 or so, then trade into the afternoon. Gaps across the midday break are routine and can be violent after morning news. If you hold through the break, that gap risk belongs in your daily budget.
• Night sessions. Major products like rebar, iron ore, and crude oil trade evening sessions starting at 21:00. Liquidity is decent, but the night session is where overseas-driven moves — a US data print, an overnight commodity rally — get priced in. If you're not actively watching the night session, flat is a position.
• Limit moves. Chinese exchanges use daily price limits, and when a product locks limit-up or limit-down, you cannot exit at any price. This is the scenario your 0.5% buffer between hard stop and cap exists for. If a product is trading near its limit, ask yourself what happens to your stop if the market locks against you — because stops don't protect you there. Only position size does.

A practical rule many experienced China futures traders follow: never let a single position's worst-case fill exceed your Tier 1 risk even with one tick of adverse slippage per contract — and in thin conditions near the session close or near limit levels, assume several ticks of slippage, not one.

Your Daily Routine Under the Cap

Let's put it all together into a repeatable session script:

• Before the open: Check the exchange rate, confirm current margin requirements, and note any products trading near their price limits from the prior session. Write down your three tiers in dollar terms.
• Scan, don't chase: Pick two or three products you know — rebar and iron ore for the black-complex trader, methanol or PTA for chemicals, soybean meal for ag. Depth beats breadth in evaluations.
• Size from the formula: Stop distance from structure and ATR, lots from the math. If the formula gives you zero lots, that's a valid answer. Take it.
• Track cumulative risk live: Realized P&L plus open stop distance, against the tiers. Half-size at 1.2%. Flat at 1.5%. No exceptions, no "one more with reduced size" at the hard stop — that's how 1.5% days become 2.1% days.
• After the session: Journal not just the trades but the sizing decisions. Did you respect the formula? Did any position's open risk overlap with another in the same complex (long rebar and long iron ore is often one trade wearing two hats — correlated risk counts once, but size it honestly)?

One more thing worth internalizing: in an evaluation, time is on your side. Most challenge structures give you weeks or months. A trader who risks 0.5% per trade and finishes days at +0.2% or −0.3% is grinding toward the profit target with essentially zero elimination risk. A trader who risks 1.5% per trade might hit the target twice as fast — or get eliminated three times as fast. The math of survival strongly favors the grinder.

Test the Framework Before You Risk the Fee

None of this is complicated arithmetic — the hard part is executing it live, when iron ore is ripping through your level and the part of your brain that wants one more lot starts negotiating. That's a skill, and like any skill it needs reps under real conditions.

That's exactly why we built XS Select. If you want to pressure-test this sizing framework against real Chinese commodity futures data — rebar, iron ore, methanol and the rest, with the daily loss caps and evaluation rules actually enforced — you can run a China futures evaluation with us starting from $29. No promises about outcomes; the market decides that. But a structure like the one above, tested on real data, will tell you quickly whether your sizing discipline holds when it counts.

The 2% cap isn't there to trip you up. It's there to force the one habit that separates traders who last from traders who don't. Size like the cap is real — because in an evaluation, it absolutely is.