Abstract: In order to investigate the accuracy of a photogrammetric block adjustment,a set of artificial photographs is designed,together with their image points as well as the corresponding ground points.The coordinates of these points are given with the added quasi-random errors produced herewith.This paper introduces the method used to generate the quasi-random data with normal distribution and the tests adopted to verify the random nature of the thus generated data.In this experment,altogether 2320 random data wish a uniform distribution are generated,from which 160 data with normal distribution arc finally produced.