Securities margin trading, also known as "securities credit trading" or margin trading, refers to the behavior that investors provide collateral to securities companies qualified for margin trading, borrow funds to buy securities (margin trading) or borrow securities and sell them (margin trading). Including securities companies financing and securities lending to investors and financial institutions financing and securities lending to securities companies. From a global perspective, the margin trading system is a basic credit trading system. On March 30th, 20 10, Shanghai Stock Exchange and Shenzhen Stock Exchange respectively announced that the margin trading system was officially opened on March 30th, 20 10, and began to accept the margin trading declarations of pilot members. Margin trading business was officially launched.