Abstract: This paper studies the locating of blunders for GPS network by using the method of one-by-one searching which was presented by Wang Xinzhou(1992),and the method is further approved in the paper.It is shown that when the following two conditions are satisfied in GPS network,blunders can be located correctly with the improved method,and the estimators of blunders can also be made.These two conditions are:n_g≤1.95n_b-3p+3;Any point should have relations to at least three baselines.