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The rapid development of the Beidou navigation satellite system (BDS) accelerates the user demands for high-precision position and navigation.International GNSS Monitoring and AssessmentSystem (iGMAS) built by China independently provides a good platform for GNSS high-precise real-time products.In this paper,the precise satellite clock error resolving model and strategy are studied,the feasibility of real-time precise clock error estimation on the premise of guarantee accuracy is researched,and the precision of real-time precise clock error using iGMAS site resources (built and planning) is verified.Theresults show:There is convergence process in the Un-difference mode to realize real-time clock estimationand the convergence RMS accuracy comparing to IGS is about 0.2ns; Epoch single-difference model eliminates the continuous ambiguity,so there is no convergence process,the precision is better than 0.2ns; On the whole,the precision of Un-difference mode and epoch single-difference model is quite; From the calculation efficiency and high-precision clock error application,the epoch single-difference model is adapt to GNSS real-time precise clock estimation because of less resolved parameters; Using iGMAS site resources(built and planning) recently,the precision of clock estimated by epoch single-difference model is about 0.2ns.