Online trading over internet has changed global trader's behavior rapidly. For the past decay, Taiwan futures market has developed richly along with the internet technology,. The proportion of traders using internet to place their orders increases year by year, changed the traditional way of trading through the assistant of broker. On the other hand, because the functionality of hacking tools are strengthened day by day, cause circuit cut off, account usurp, website security and manipulation of trade content cause the threat to the security of internet trading. This text discussions the technology of internet trading security and suggests concrete practices of promoting its security in order to reduce the emergence of the threat in the future.