It takes some time for the exchange to apply for the trading code. Generally, accounts opened before 3pm (applying for transaction code) can be traded on the second trading day; accounts opened after 3pm can apply for transaction code on the second day and can be traded on the third trading day. In stock index futures trading, you must invest 500,000 yuan to apply for trading code in CICC on the second trading day and trade on the third trading day.