Abstract: Paired broadcast synchronization (PBS) is an important synchronization protocol for wireless sensor (WSNs). Because of the limited size, limited communication ability, the lower storage space, and limited energy, it is very necessary for traditional clock synchronization protocol to improve. Therefore, the clock synchronization algorithm in wireless sensor network will be of great significance. By studying single cluster network synchronization, the multi-cluster network synchronization is proposed, and cites (Network-wide Pair selection Algorithm) NPA and (Group-wise Pair selection Algorithm) GPA algorithms in this paper, and make a simulation comparison between them. The results show: in the case of less sensor nodes, NPA algorithm and GPA algorithm nearly play the same performance in processing the message in the network; in the case of many more sensor nodes, GPA algorithm is obviously better than NPA algorithm based on information processing process, greatly reducing the message the number of packets. Finally, new promising study field is proposed based on the PBS.