Abstract: In view of network topology of fuzzy control and monitoring system of underground hydraulic support, the paper proposed a time synchronization algorithm adapted to wireless sensor network of linear structure which includes adjacent cluster synchronization and internal cluster synchronization. The adjacent cluster synchronization adopts bisynchronous mechanism which corrects time offset to decrease synchronization errors. The internal cluster synchronization obtains frequency and phase offset between any node and head node in the cluster by constructing logic clock function through least square linear fitting method to improve synchronization precision. The simulation results show that the algorithm can effectively reduce synchronization errors and energy consumption.