According to Article 4 of the Measures for the Implementation of the Suitability System for Stock Index Futures Investors (Trial), members of futures companies can only apply for opening stock index futures trading codes for natural person investors who meet the following criteria: ① The balance of available funds in the margin account when applying for opening an account is not less than RMB 500,000; ② Have basic knowledge of stock index futures and pass relevant tests; (3) There are records of more than 20 stock index futures simulation transactions for 10 trading days, or there are records of more than 10 commodity futures transactions in the last three years; ④ No serious bad credit record; ⑤ There are no laws, administrative regulations, rules and business rules of the exchange that prohibit or restrict stock index futures trading.