Abstract: A WSNs model of vibration monitoring of mine equipment was given combined with actual situation of vibration monitoring of mine equipment. In order to solve problems of large energy consumption of TPSN algorithm and low precision of DMTS algorithm, an improved WSNs time synchronization algorithm named TPDM algorithm was proposed. In TPDM algorithm, cluster head nodes are selected by use of dynamic selection algorithm of cluster head. TPSN algorithm is used for time synchronization among the cluster head nodes to improve synchronization precision and DMTS algorithm is used among nodes in a cluster to reduce energy consumption. Meanwhile, synchronous clock is compensated by use of clock skew compensation algorithm based on the minimum square linear regression. The simulation results show that TPDM algorithm gets a compromise between precision and energy consumption compared with TPSN algorithm and DMTS algorithm, which can meet with requirements of vibration monitoring of mine equipment preferably.