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The update rate of vector tracking loop (VTL) is usually the same as the message rate modulated in navigation signal,and BeiDou satellites broadcast D1 NAV message and D2 NAV message which will lead conflict of update rate for VTL.To solve this problem,a novel vector tracking loop based on non-coherent discriminator is proposed and a method to optimize its update interval is also introduced.Analysis and simulation show that for low dynamic user,the update interval can be designed longer than 0.1s and the complexity of VTL can be reduced largely.If the update interval is 0.3s,this algorithm can track the signal broad-casted by GEO satellites in steady when C/N0 is lower as 20dBHz.