Abstract: The essential component and the characteristic of GNSS software receiver were described according the principle of GNSS software receiver.The key modules,which include the signal processing module,the signal acquiring and tracking module,and the navigation ephemeris resolution module,were introduced emphatically.In order to test the effectiveness of these modules,actual collection results of signal acquisition,tracking and positioning precision were performed.The results demonstrate that the proposed algorithms of signal acquiring,tracking,and navigation resolution can be carried out correctly and conveniently,and the single point static positioning can be realized.The result precision can reach 10 m when GDOP value is less than 4.