The intertemporal cover of the same variety in different months uses the price difference, or the contract correlation is extremely high and the standard is similar. For example, plastics and pvc are very similar, both of which are 5 tons. It is feasible to use the spread at this time. Cross-species arbitrage pushed by other exchanges has also spread, such as soybean oil and palm oil arbitrage, corn and corn starch arbitrage and so on.

For different varieties, different volatility and different contract settings, we generally use proportional analysis to set the number of lots according to the proportion or capital equivalent. Such as iron ore and rebar, copper and zinc.