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← Back to Blog · 2026-10-20 · 7 min read · Market Preview

Why is my trade working in the morning but bleeding by the afternoon? If you trade Chinese commodity futures, you have likely felt this specific frustration. You read the macro news, you checked the inventory data, and you took a position. The futures price moves in your favor, but your P&L doesn't reflect it, or worse, the spot market moves independently, leaving you exposed to a hidden risk. This is the silent killer of retail accounts: ignoring the basis.

For global traders looking to trade rebar, iron ore, or coking coal, the futures price is not the whole story. In China, the physical goods market (spot) often dictates the floor and ceiling of the futures market in ways that Western traders might not immediately grasp. The relationship between the two—the basis—is where the real alpha lives for sophisticated participants. It is not just about direction; it is about convergence.

This article cuts through the academic noise. We are not here to define basis as "spot minus futures" and leave you there. We are here to explain how to read the basis as a signal for entry, exit, and risk management in the Shanghai Futures Exchange (SHFE) and Dalian Commodity Exchange (DCE) ferrous metals complex.

Understanding the Mechanics: Not All Bases Are Created Equal

Before you can trade the spread, you must understand the instrument. In the US, you might trade WTI crude or Gold futures where delivery is standardized and logistics are relatively streamlined. In China, the ferrous metals market is fragmented, regional, and heavily influenced by logistics and policy.

When we talk about basis in Chinese commodity futures, we are usually referring to the difference between the local spot price (e.g., Shanghai or Tangshan spot rebar) and the nearest active futures contract. However, you must be precise about which spot price you are using. A basis based on a national average index is useless for a trader executing on the SHFE. You need the delivery-point basis.

Key Contract Specifications for Ferrous Metals

To trade the basis effectively, you need to know the hard numbers that drive the arbitrage. Here are the critical specs for the two most liquid ferrous contracts:

The critical takeaway here is leverage. Because the contract multipliers are high (100 tons for iron ore), a misinterpretation of the basis can lead to rapid margin calls. If the spot price collapses while futures hold steady due to speculative buying, the basis widens. If you are long futures, you are betting on convergence. If convergence never happens because spot demand evaporates, you are fighting the physical market.

Reading the Signal: Contango, Backwardation, and the "Real" Demand

Textbooks tell you that a normal market is in contango (futures > spot) due to cost of carry. In Chinese ferrous metals, this theory often breaks down during periods of stress. You must learn to read the market structure not as a static state, but as a dynamic signal of supply and demand tension.

When you see backwardation (futures < spot) in rebar or iron ore, it is rarely just about carry costs. It is a screaming signal that current physical demand is outstripping supply, or that logistics are broken. During the 2021 commodity rally, we saw extreme backwardation in various Chinese industrial metals. This wasn't an anomaly; it was the market pricing in scarcity.

Conversely, a deeply negative basis (futures >> spot) suggests that the futures market is pricing in future strength that the physical market does not yet validate. This is often a trap for retail traders who buy the dip on futures while ignoring that the physical mills are struggling to sell their own inventory. If spot prices are falling faster than futures, the basis is weakening. This is a red flag. It suggests that the "smart money" is using the futures market to hedge long physical positions, effectively selling into the futures rally.

Practical Rule: Do not trade the direction of the futures price in isolation. Always check the basis trend. If futures are rising but the basis is weakening (spot is falling or rising slower), the rally is fragile. It is likely driven by financial speculation, not physical demand.

The Regional Arbitrage: Why Shanghai Rebar Is Not the Same as Tangshan Rebar

One of the biggest mistakes global traders make when trying to trade rebar is assuming the futures price reflects the national average. It does not. The SHFE rebar contract is physically deliverable in specific regions, primarily around Shanghai and other major consumption hubs. However, the bulk of Chinese steel production happens in provinces like Hebei (Tangshan).

This creates a regional basis. If you see a spike in Tangshan spot prices but the SHFE futures remain flat, do not immediately buy the futures. You must account for freight costs. If the spread between Tangshan spot and Shanghai futures is less than the cost of transportation (rail + road + handling), the arbitrage will not close. The basis will persist.

Experienced traders monitor the "shipping basis." When the local basis (Shanghai spot vs. Shanghai futures) is tight, but the regional basis (Hebei spot vs. Shanghai futures) is wide, it indicates a logistical bottleneck or a regional surplus. This is actionable intelligence. A widening regional basis often precedes a correction in futures prices as cheap steel from the north floods the south, forcing prices down.

Inventory Data and the Basis: The Leading Indicator

Weekly inventory reports from Mysteel or other Chinese data providers are vital, but they are lagging. The basis is often the leading indicator. Why? Because inventory data is reported at the end of the week, but the basis is updated in real-time as spot quotes change.

Consider this scenario: Inventory reports show a drawdown (bullish). However, the basis on iron ore is widening negatively (bearish). What does this mean? It means that while total inventory is down, the quality or location of the inventory is causing friction. Perhaps high-grade ore is scarce, but low-grade ore is piling up. If you are trading the generic iron ore futures, you might be exposed to the wrong segment.

How to Use Inventory + Basis for Entry

Here is a practical framework for your China futures strategy:

  1. Check the Trend: Is the basis strengthening (spot catching up to futures) or weakening?
  2. Check Inventory: Is inventory rising or falling?
  3. The Confluence:
    • Strong Basis + Falling Inventory: High confidence bullish signal. Physical demand is real. Long futures.
    • Weak Basis + Falling Inventory: Caution. The rally is likely financial. Look for short entries or take profits on longs.
    • Strong Basis + Rising Inventory: Bearish divergence. Supply is building, but spot demand is still desperate. This is a fragile state. Often precedes a sharp correction once spot demand tires.
    • Weak Basis + Rising Inventory: High confidence bearish signal. The market is oversupplied and demand is weak. Short futures.

Managing Risk: The Cost of Convergence

Trading the basis introduces a new risk: convergence failure. In a perfect world, futures prices always converge to spot prices at expiration. In the real world, especially in Chinese commodity futures, delivery rules, quality disputes, and policy interventions can prevent this.

For example, if the government imposes export restrictions or production quotas (as seen in the aluminum and steel sectors over the last few years), the fundamental link between spot and futures can be temporarily severed. During these times, the basis can become irrational. A futures contract might trade at a massive premium to spot because traders are betting on policy changes, not physical supply.

To manage this risk, you must define your "basis stop." This is not a price stop, but a structural stop. If the basis moves beyond a certain historical standard deviation (e.g., 2 standard deviations from the 3-month mean) without a corresponding fundamental news event, the market is likely distorted. This is the time to reduce position size or step aside, not double down.

Practical Application: A Step-by-Step Checklist

Before you place your next order on the SHFE or DCE, run through this checklist. This is how professional desks approach the basis trade:

Remember, the basis is not a magic bullet. It is a lens. It helps you distinguish between a "paper rally" and a "real economy rally." For a retail trader, this distinction is the difference between a winning trade and a blown account.

Test Your Edge in the Real Environment

Understanding the theory of basis trading is one thing; executing it under pressure is another. The Chinese commodities market moves fast. Sentiment shifts in minutes. If you want to know if your strategy holds up, you need to test it against live data without risking your capital.

You can validate your understanding of China futures mechanics and basis logic by testing your system on a real-data China futures evaluation at XS Select. It is a straightforward way to see if your entries and exits align with the market's reality. Starting from $29, it is a low-barrier way to gain the discipline and data feedback that most retail traders lack. If you are serious about trading rebar or iron ore, stop guessing and start measuring.

The basis is always speaking. Are you listening?

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