Locking is generally divided into two ways, namely profit locking and loss locking. The so-called lock position generally refers to an operation method in which investors open positions with the same amount but in the opposite direction, so that the profit and loss of positions will not increase or decrease no matter where the price changes. Mainly solve the problem of intraday consolidation, so that the position in hand is in the best position in the possible reversal market, with the lowest cost. Mergers are mainly divided into periodic mergers between communities.