Under ideal conditions,the correlation function of the satellite navigation signals emitted iscompletely symmetrical,and the pseudo-range obtained receivers to different satellites is consistent.However,live signals differ from this ideal due to satellite navigation overload characteristic difference,the troposphere and the ionosphere,multipath effects and other factors,the signals emittedby each satellite reaching the ground show a non-ideal characteristics and differences oneach other,resulting in the biases of pseudo-range measured by receiver to the different satellite.In this paper,based on the signal correlation domain analysis and observations data domain analysis,the method of combining with beidou system signal quality monitoring equipment and monitoring receiver receive treat-ment establishment system B1I and B3I navigation signals respectively.The analysis results show that the pseudo-rangebias of B1I signal between different satellite navigation signal is 2 ~ 3 ns,which B3I bias within 1 ns,and navigation satellite broadcast signal ideality and inconsistency might be the main factor of pseudo-range bias,and receiver channel design,loop design and other factors can also affect pseudo-range bias value..