Abstract: Security issue is crucial to the application of wireless sensor network（WSN），and key management is the kernel of security issues.A new secure triple-key management scheme is presented，which optimizes the procedure of keys computation，and improves the secure routing algorithm.Consequently the ability of resilience against attacks is increased，the greater scalability is supported，and the storage overheads of network are decreased a little.This scheme is adapted to application of wireless sensor network which requires high security performance.