WIA-PA is a wireless network system for industrial measurement, monitoring and control based on IEEE 802.15.4. As a new kind of wireless network system, its security is extremely important. In order to ensure the security of WIA-PA network, we have designed WIA-PA network key management system, established a centralized key management mode, thus ensure WIA-PA network security communication services. Through the test of security key management, the safety of the key management system is verified.