LME's decision to cancel the nickel futures contract on March 8 was made by LME Clearing House according to the trading clearing rules. LME's rule design is based on the over-the-counter transactions in the international market and the market between large households. However, in terms of core protection measures, maintaining market order and risk response, the system design is essentially similar to that of the mainland trading market. When the market fluctuates extremely and fails, exchanges and clearing houses can take measures to control risks and maintain normal market order. The suspension of nickel futures trading is in line with market conditions.