XU Yong-liang1,2，HUA Yu1，WU Xiao-liang1,2

（1. National Time Service Center, Chinese Academy of Sciences, Xi’an, Shaanxi 710600, China;

2. Graduate University of Chinese Academy of Sciences, Beijing 100039, China）

Abstract：The process to construct a wireless sensor network time-synchronization test-bed based on the GAINS（global actable intelligent networks）nodes is presented, and the timing-sync protocol for wireless sensor networks（TPSN）has been realized. The hardware and software of this test-bed are elaborated in detail. Based on this test-bed, more complex time-synchronization protocols can be further studied and developed for application to practical sensor network.

Key words：wireless sensor network；test-bed；time-synchronization