SET协议是电子商务交易中较为安全的交易协议,CA中心是目前保证网络信息安全的一种比较可靠的安全机构,基于SET协议的CA中心系统能够进一步地保证电子商务交易的安全。本文首先介绍了SET协议的基本原理和技术基础;接着从安全性的角度对CA中心系统的组成与功能进行了深入的分析;最后以SET协议为基础,为CA中心的构建提出了一个较为安全可行的实现方案。 The SET protocol is a relatively secure transaction protocol in e-commerce transactions. CA Center is a relatively reliable security mechanism to ensure network information security. The CA center system based on SET protocol can further ensure the security of e-commerce transactions. This paper first introduces the basic principles and technical basis of the SET protocol. Then from the security point of view of the CA center system components and functions conducted in-depth analysis; Finally, based on the SET protocol for the CA center to build a more secure Feasible implementation plan.