Abstract: In order to reduce number of accidents happening in railway crossroad，application of WSN（wireless sensor network） is researched based on detection of vibration signal of running train.Clustering multi-hop tree-like routing algorithm is proposed to curtail number of nodes participating in network，and further save whole-network energy；vibration signal aggregation mechanism is used to get high data processing accuracy.Exploiting IRIS mote and MTS400CB sensor-board supervising system is designed and bridging function is realized between wireless network and wired network.Simulation results show that the system is reasonable and reduce energy consumption of nodes，and as well can prolong lifetime of system.