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In our software receiver design,the focus is on the baseband signal processing of Big Dipper’s B1 band Branch I signals. In the paper,we introduce the theory of the Spread-spectrum System and process of Big Dipper’s B1 signal,the algorithms for parallel code phase search acquisition,and phase discrimination aided tracking loop. We also present a second-order digital loop filter of which parameters are ,(Hz). Meanwhile,Adopting Matlab software to simulate Big Dipper signals and realized the acquisition and tracking algorithm. And verifying the algorithm by processing simulation signal and the real satellite signal separately.We also put forward the improved method of frequency-locked loop(FLL)aided phase-locked loop(DLL).Then provide a basis for further study of Big Dipper software receiver.