Online bank is the one of the most Influential finaneial innovation of the 20th Century. Although the online bank has a good foreground, the problem about transaction security is always restricting the development of online bank. With the diversification of financial crime on net-work and the ubiquitous disadvantages of current transaction security, the matters about security has become the bottleneck of the online bank development. After analyzing the development of international online bank, this thsis considers that ocerall planning should be ensured on the basis of prudence,the internal and external should work together to strengthen the risk control and management of online bank.We should fradually empolder the online bank in depth based on the traditional bank,meanwhile increase the force of technical defendance and off-site supervision,build up internet0-bank risk supervision system,finally,we should consummate the correlative law or regulation,protect the security of online bank transaction roundly.