Abstract: As the launch of the BeiDou navigation satellite system (BDS) completed,it realizes the three-step development strategy,which can provide RNSS service for global users and RDSS and SBAS service for regional users.In order to analyze the differences of the timing in different services,we have compare the timing and space reference,operating requirement and device delay in RDSS one-way／two-way timing,RNSS signal single frequency／double frequency and SBAS signal single frequency,and provide different timing results based on different models proposed in the paper.It can provide reference for the development,production and testing for the timing user with BDS.