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The paper focuses on the performance of multi-GNSS(GPS,BDS,GLONASS,and Galileo)precise point positioning(PPP)of three commonly used models including Un-differenced(UD)model,UofC model and Un-combination(UC)model with the products from international GNSS Monitoring and Assessment System(iGMAS).The convergence time and positioning accuracy are investigated.As a comparison,the same processing strategy is employed by using the GBM products provided by Helmholtz-Centre Potsdam-German Research Centre for Geosciences(GFZ).Daily GNSS measurements from 10 stations observed during 30 days in 2015 are used.The result shows that:(1)the convergence time of three multi-constellation PPP models are 22.25min,18.92min and 20.21min,respectively.