It refers to two specific situations that occur in the last few minutes of the trading day, that is, the stock index futures and the stock market rise at the same time, which is called night double gold. Among them, "evening" refers to the last few minutes of the trading day, while "double gold" refers to the simultaneous rise of stock index futures and stock market. This situation is usually regarded as a buying signal of the stock market, which indicates that the stock market will have an upward trend in the next period of time.