In view of the traditional system of thermal power plant steam pipe of abnormal pressure problem of low detection accuracy. Based on CAN was designed and implemented a distributed network and abnormal pressure sensor PTG502 boiler steam pipeline pressure test system. CAN adopt distributed network control system, the whole system in various key parts of the boiler pipe pressure sensor deployment PTG502 on the pressure signal acquisition, real-time detection of all the pressure signal is processed in the network to send to micro controller make a comprehensive analysis of the micro controller algorithm according to set procedures, determine which parts of the abnormal pressure and send data real-time pipeline control center system, so that the main control center in time to stop pressure and send out sound and light alarm, effectively reduce the safety accidents. The experimental results show that:in this paper, the design of the system stability is strong, greatly improve the accuracy of detection data, meet the actual demand. 