Abstract: Detailed analysis is made on wireless sensor network(WSN) OS hardware platform environment,system features and basic functions,and a novel OS architecture providing reasonable function division between kernel level and service level is proposed.A kernel structure is presented,which adopts data fusion to support precision-demanding clock synchronization tasks.Relative kernel service routines and basic data structures are carefully designed. Experimental results suggest that the multi-hop error accumulation of the clock synchronization algorithm is reduced after data fusion.