← Back to Blog · 2026-10-18 · 4 min read · Trading Education
There is a specific kind of silence that descends on a trading desk when the Shanghai Composite opens and the volatility spikes. It is not the silence of peace; it is the silence of held breath. For global retail traders accustomed to the relatively linear movements of S&P 500 futures or the rhythmic oscillations of EUR/USD, the Chinese futures market can feel like stepping into a hurricane with a umbrella made of paper.
The allure is obvious. The liquidity is massive, the trends are often brutal and sustained, and the interconnectivity with global manufacturing makes these contracts essential for understanding the real economy. But the danger is equally potent. A single policy announcement from Beijing or a sudden supply chain disruption in Shanxi can blow through standard risk parameters in seconds. If you are treating Chinese commodity futures with the same position sizing logic you use for crude oil or gold, you are not trading; you are gambling with a higher house edge.
This guide strips away the theory. We are going to look at the mechanical reality of trading rebar, iron ore, and thermal coal. We will define what "risk per trade" actually means when the tick value is high, and how to size positions so that you survive the volatility rather than just hoping to profit from it.
The Myth of "Lot" Sizing: Know Your Contract Multipliers
The biggest mistake newcomers make when entering the Chinese futures market is assuming that "one lot" means the same risk across different exchanges or products. In many Western markets, a futures contract is standardized. In China, the contract multiplier is the hidden variable that dictates your exposure.
To size positions correctly, you must first master the arithmetic of the contract. You cannot manage what you do not measure. Before you place a single order, you need to calculate the Tick Value for the specific instrument. This is not just about knowing the price; it is about knowing the money.
- Rebar (RB): Traded on the Shanghai Futures Exchange (SHFE). The multiplier is 10 tons per lot. If the tick size is 1 CNY/ton, one tick move equals 10 CNY. If you are trading 5 lots, a single tick against you costs you 50 CNY. This sounds small until you realize that Rebar can move 100 ticks in a single morning session.
- Iron Ore (I): Traded on the Dalian Commodity Exchange (DCE). The multiplier is 100 tons per lot. The volatility here is notorious. A 1% move in Iron Ore is not a 1% loss; depending on leverage, it can wipe out a small account in minutes.
- Thermal Coal (ZC): Also on ZCE. The multiplier is 100 tons. Remember the 2021 energy crisis? Thermal Coal prices soared as supply constraints hit, followed by intense regulatory intervention. The swings were hundreds of points. If you were long 10 lots during that rally without proper sizing, the drawdown would have been catastrophic before the reversal.
Practical Rule: Never size a position based on "how many lots feel right." Size based on the tick value. If your maximum loss per trade is $100, and the Rebar tick value is roughly $1.40 (depending on the CNY/USD rate), and you have a stop-loss of 20 ticks, your risk per lot is $28. You can hold 3 lots. If you hold 4, you are over-leveraged. It is that simple.
Volatility-Adjusted Sizing: The ATR Method
Fixed-lot sizing is a relic. It works in calm markets, which China futures rarely are. The Chinese market is driven by policy, weather, and global demand shocks. Therefore, your position size must be inversely proportional to current volatility. When volatility expands, your position size must contract.
The most practical tool for this is the Average True Range (ATR). The ATR measures the average range of price movement over a specified period. It tells you how much "noise" the market is making.
How to Apply ATR to Chinese Futures
Let’s say you are trading Iron Ore. You check the 14-period ATR on the daily chart. If the ATR is 20 points, the market is moving 20 points on average per day. If you set a stop-loss at 30 points, you are giving the market enough room to breathe. But if the ATR spikes to 50 points due to a sudden supply news event, a 30-point stop is now within the noise. You will get stopped out by normal market breathing, not by a change in trend.
Here is the workflow:
- Determine Account Risk: Decide what percentage of your account you are willing to lose on this trade (e.g., 1%).
- Check Current ATR: Look at the 14-day ATR for the specific contract.
- Set Stop-Loss Distance: Typically 1.5x to 2x the ATR. If ATR is 30, stop is 45-60 points away.
- Calculate Position Size: Divide your dollar risk by the (Stop-Loss Points × Tick Value).
When volatility is high, the ATR is high. This increases the denominator in your calculation, which automatically reduces the number of lots you can buy. This is not passive; it is active risk management. You are letting the market tell you how much you can afford to hold.
Liquidity Constraints and Slippage: The Hidden Cost
When trading Chinese commodities, you are not just trading price; you are trading liquidity depth. The order books on the SHFE and DCE are deep, but they are not infinite. High-volatility events often thin the order book instantly.
If you are trading a low-liquidity contract month (a non-dominant month), you will suffer from slippage. Slippage is the difference between the price you intended to get and the price you actually got. In a fast-moving market, this can add 2-3 ticks to your entry and subtract 2-3 ticks from your exit. This effectively widens your spread and increases your breakeven point.
Actionable Tip: Always trade the dominant contract month. In China, the dominant month usually shifts slightly before the first day of the contract month. Monitor the open interest (OI) daily. If OI is dropping in your current month and rising in the next, roll your position. Trading illiquid months is a silent killer of position sizing strategies because it distorts your actual risk exposure.
Correlation Risk: When "Diversification" Fails
Many traders believe they are diversified because they hold long positions in Rebar, short positions in Iron Ore, and long positions in Coking Coal. On paper, these are different assets. In reality, they are often the same trade: "Chinese Construction Demand."