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A global frame of secure instant messaging system based on Microsoft MSN is proposed to solve the security problems that exist in instant messaging. A secure add-in is designed and integrated seamlessly into the MSN client utilizing interfaces of the MSN client. The identity based cryptography is introduced into the secure instant messaging field and thus a secure instant messaging key management module based on IBC is designed and implemented. At last, the results of the performance test of the add-in and key management module show that, in the precondition of being compatible to MSN, the system could solve the secure problems between instant messaging users such as key management, identity authentication, message encryption and authentication etc.