scalping transaction generally refers to a fast-forward and fast-out transaction. Scalping transactions generally appear in leveraged financial derivatives such as foreign exchange margin, gold, crude oil and global stock index futures. According to the trading strategy, there are two main types. One is simple fast-forward and fast-out, which uses high profit rate to make profits, and needs to make certain judgments on market trends, support levels and resistance levels; The other is the transaction that takes advantage of platform vulnerabilities. Because of the quotation source, server speed, network speed and other reasons, the quotations between different platforms are not synchronized. Speculators use the platform with fast quotation as a reference and operate on the platform with slow quotation. Because they know the short-term trend in advance, the accuracy is extremely high.