Aiming at the problem of typical time synchronous algorithms used in wireless sensor networks mainly focus on increasing network synchronization precision but ignore the network energy consumption

a cluster-based energy-efficient time synchronization algorithm for wireless sensor networks is proposed.This algorithm is based on cluster network topology structure

base station and cluster heads use improved bidirectional synchronization mechanism to spread the synchronization message packets

cluster heads and cluster nodes use bidirectional synchronization mechanism combined with passive listener to complete time synchronization which reduces number of transmission message packets and periodic update factor of synchronous packet delay is designed

and further reduce message overhead.Simulation results show that the scheme can reduce the energy consumption and synchronous packets overhead in networks as well as ensure high synchronization precision.