针对电力系统的信息安全需求,设计和实现了基于公钥技术的电力数字证书服务系统(PCSS),讨论了其技术特点,分析了该系统自身的安全性,并介绍了其在电力业务服务器身份认证中的应用。PCSS是一个安全支撑平台,能为它上面的应用系统提供强身份认证、加解密、签名验签、时间戳等安全服务,有效地解决了电力应用系统网络上用户身份认证和安全传输的问题。PCSS的实施将加速数字电力系统的实现进程。 According to the demand of information security in power system, this paper designs and implements Power Digital Certificate Service System (PCSS) based on public key technology, discusses its technical features, analyzes its own security and introduces its application in Power Business Server Application of certification. PCSS is a security support platform that can provide strong authentication, encryption and decryption, signature verification, time stamping and other security services for the above application system, and effectively solves the problems of user identity authentication and secure transmission on the power application system network. The implementation of PCSS will accelerate the realization of digital power system.