Traditional trading methods include written trading and telephone trading. In written form, the customer fills in the trading order form on the spot and sends the order to the exchange through the salesman of the futures brokerage company; The telephone method is that the customer sends the instructions to the order taker of the futures brokerage company by telephone, and the order taker synchronously records them and sends them to the exchange. With the development of computer technology, in addition to the above trading methods, futures brokerage companies have also added the following electronic trading methods: (1) popular self-help entrusted trading. At the trading site, customers trade through the computer (the computer is connected to the trading host of the exchange through the server of the futures brokerage company). (2) Telephone voice entrusted transaction. The customer converts the trading instructions into computer instructions through the telephone keyboard, and then the computer sends them to the exchange host. Because its operation process is very complicated, it must be completed step by step according to the prompt voice, and there must be a wait between each step. Therefore, even if some futures brokerage companies adopt this trading method, not many people actually use it. (3) Online transactions. Use the internet to conduct transactions. Because online trading is not limited by region, it has the advantages of fast trading and return, high accuracy and low cost, so it is welcomed by traders and futures brokerage companies and is also the fastest trading method. However, the new trading mode is mainly carried out by computers, which may cause some additional risks due to computer systems or communication transmission systems. Therefore, if the customer chooses the electronic trading mode, the futures brokerage company will require the customer to sign the Supplementary Agreement on Computer Self-help Entrusted Trading, the Risk Disclosure of Online Futures Trading and the Supplementary Agreement on Online Futures Trading at the same time.