Abstract: A gas pipeline inspection system based on wireless sensor networks is introduced in this paper. The voltage changes caused by force change in some nodes in the pipeline shall be sampled and sent through wireless communication to collector, and then the collector shall send it to the server, who will judge if the gas pipeline is impaired. Authentication technology has been fully applied in this system. Authentication technology based on secret information and physical security will ensure the communication being under warrant and avoid unauthorized party getting the information.