Abstract: Objective For in-orbit Beidou satellites,we make use of precise orbit for broadcast ephemeris SIS erroranalysis.We not only estimate SISURE,but also take correlation analysis and normality test.Through observational data of October 2012we find that the average SISURE is 1.45m;the R-TandT-N have low correlation,while among the other components are micro-correlation.We also find thatnearly all the SIS error components do not fit the normal distribution,and large errors can be detectedby kurtosis abnormal values,while systematic bias can be detected by skewness abnormal values.