Abstract: This paper firstly analyzes the necessity of secure authentication for the electric medical record system，and then researches the Cookie technology emphatically，discusses the application system of secure Cookie in detail，and analyzes the secure character of secure Cookie with the technology of PKI digital authentication.Further，with the research of role-based access control，this thesis puts forward an effective secure system based on Web.This system utilizes the secure Cookie to guarantee the security，in the mean time，introduces the cache system to improve the efficiency of achieving privilege.Through the syntheses experiment with actual data，it is proved that this system has enhanced the efficiency in some degree.Finally，the present thesis analyzes the application of this system in the electric medical record system with its characters.