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In view of the problem of low computational efficiency of traditional grid point method when analyze the constellation coverage performance of target area,the traditional grid point method is improved by using the idea of estimating population parameters through sample statistics in sampling theory.Through analyzing the relationship between the constellation coverage performance of all grid points in the target area and grid points’ latitude and longitude, the stratified random sampling method was established, the layer division method and the distribution way of sample size in each layer are researched.According to the statistical characteristics of different indexes,the improved grid point method gives the way to estimate different coverage performance indexes of constellation and calculate the number of grids with different precision, the process of the improved grid point method is also established. Finally, the average PDOP value of the target region of the Beidou satellite navigation system is calculated through the improved method, by comparing the simulation results with the traditional grid point method, it is proved that the improved method can significantly improve the computational efficiency while ensuring the accuracy of calculation.