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← Back to Blog · 2026-10-25 · 8 min read · Market Preview

If you have ever stared at a chart for Shanghai Rebar (RB) futures wondering why price action seems disconnected from the daily news flow in Tangshan or Hangzhou, you are not alone. For international traders entering the China futures market, the single biggest friction point is often not technical analysis, but the fundamental disconnect between the physical market and the paper market. This disconnect is known as the basis.

In mature markets like the US, basis trading is a niche strategy for commercial hedgers. In China, particularly in the steel sector, understanding the basis is a prerequisite for any serious trader. The Chinese steel industry is massive, highly regulated, and physically constrained by logistics and government policy. Consequently, futures prices do not always move in lockstep with spot prices. If you ignore the spot-future spread, you are trading blind. This guide breaks down how to interpret these spreads, the mechanics behind them, and how to use this data to refine your edge in Chinese commodity futures.

Why the Basis Matters More in China Than Elsewhere

In Western markets, efficient arbitrage often keeps spot and futures prices tightly correlated. In China, structural inefficiencies create persistent, tradable divergences. Several factors drive this:

For a trader looking to trade rebar/iron ore, the basis is not just a noise filter; it is a leading indicator. A widening negative basis often signals that the physical market is oversupplied, suggesting that futures rallies may be short-lived. Conversely, a positive basis (spot higher than futures) indicates physical tightness, providing a fundamental floor for futures prices.

Contract Specifications: Know Your Instrument

Before interpreting the spread, you must know the exact specifications of the instruments you are trading. Ambiguity in contract details is a common source of operational error for new entrants. Here are the core specs for the two primary steel-related contracts on the Shanghai Futures Exchange (SHFE) and Dalian Commodity Exchange (DCE).

Rebar Futures (RB)

Iron Ore Futures (I)

Practical Tip: When calculating the basis, always ensure you are comparing apples to apples. For Rebar, compare the front-month futures price against the spot price of HRB400 Φ20mm rebar in Shanghai (the benchmark delivery location). For Iron Ore, compare against the spot price of 62% Fe fines delivered to Qingdao port.

Interpreting the Basis: Three Key Scenarios

Traders often ask: "Is a wide basis a buy signal or a sell signal?" The answer depends on the direction and the context. Here are three common scenarios you will encounter in the China steel sector.

1. Negative Basis (Backwardation)

This occurs when the spot price is higher than the futures price. In steel, this is a bullish signal for the physical market but can be tricky for futures traders.

2. Positive Basis (Contango)

This occurs when the futures price is higher than the spot price.

3. Basis Normalization

As an expiry approaches, the gap between spot and futures must close. This is the "pull" of convergence.

Practical Application: How to Track the Basis

You cannot trade what you cannot measure. For global traders, accessing reliable, real-time spot data for Chinese steel can be challenging. However, you do not need to be a local insider to get a high-probability view.

Step 1: Identify Reliable Spot Sources

Use widely recognized Chinese commodity data providers. While some require subscriptions, many offer delayed data or headline indices for free. Key sources include:

Step 2: Calculate the Spread Manually or via Tools

Most international trading platforms do not automatically display the basis for Chinese futures. You must build this into your workflow.

Step 3: Analyze the Trend, Not Just the Level

A basis of +100 RMB is not inherently bad. It depends on the seasonality and the trend.

Risk Management and Common Pitfalls

Trading based on basis requires a different risk profile than pure technical trading. Here are the red lines you must respect.

1. The "Policy Risk" Black Swan

Never trade the basis in isolation during periods of active government intervention. In recent years, Chinese authorities have directly intervened in commodity markets to curb speculation. For example, during volatility spikes in energy and metals, exchanges have raised margin requirements and position limits. If the government announces a crackdown on speculation, the basis can collapse overnight as speculative premiums evaporate. Always check the news feed for regulatory announcements before entering a basis-driven position.

2. Liquidity Mismatches

Chinese futures liquidity is highly concentrated in the front-month contract. Spreads involving far-month contracts can be illiquid. If you are attempting a calendar spread (buying one month, selling another), ensure you have sufficient depth on both sides. Slippage on a 50 RMB tick can destroy your edge.

3. Currency and Settlement Risks

For international traders, remember that Chinese futures are settled in RMB. While many platforms offer USD margin, the underlying exposure is to the RMB. Exchange rate fluctuations can impact your P&L. Furthermore, ensure your broker supports physical delivery or has a clear process for closing out positions before the last trading day to avoid unintended delivery obligations.

Putting It All Together: A Framework for Entry

So, how do you combine this into a actionable trade? Here is a simple framework for a Rebar long setup:

  1. Check the Macro: Is there positive news on infrastructure stimulus or property sector easing? This provides the tailwind.
  2. Check the Basis: Is the basis negative or narrowing? A negative basis indicates physical tightness, supporting a long bias.
  3. Check the Technicals: Is the price above key moving averages? Are there bullish divergences?
  4. Execution: Enter the long, but set a tighter stop-loss than usual. If the basis widens positively (spot falls or futures rise disproportionately), exit immediately, as the physical market is rejecting the price.

Conversely, for a short setup:

  1. Check the Macro: Are inventory levels rising? Is construction activity slowing?
  2. Check the Basis: Is the positive basis widening? This indicates speculative froth.
  3. Execution: Short the futures. Your target is convergence—when the futures price falls to meet the spot price.

Conclusion: Discipline Over Prediction

Basis trading in China’s steel sector is not about predicting the future; it is about aligning your trades with the reality of the physical market. The futures market is a derivative of the physical world, and in China, the physical world is governed by logistics, inventory, and policy. By monitoring the spot-future spread, you gain a filter that removes much of the noise.

This approach requires discipline. It requires you to look away from the chart occasionally and look at the news, the inventory reports, and the spread. It is a more complex way to trade, but it offers a more robust framework for trade rebar/iron ore in one of the world's most dynamic markets.

Before deploying real capital in these volatile markets, it is crucial to validate your strategy under pressure. If you want to test your basis-trading logic or refine your risk management skills, you can test your system on a real-data China futures evaluation at XS Select (from $29). This allows you to experience the volatility and spread dynamics without risking your own capital, helping you determine if this style of trading suits your personality and capital base.

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