The invention provides a method for testing a wind power service capacity upper limit value of a power system. The method comprises the steps of improving the calculating efficiency of sequences with probability distribution similarity, fully utilizing the characteristic that the probability distribution of active output of a wind power plant in different limited situations has great similarity to put forward a separating algorithm, utilizing a probability change sequence to substitute an original probability sequence to carry out sequence operation, and using the high sparsity of the probability change sequence to remarkably reduce calculated amount and improve calculating speed. No any similarity exists in the whole calculating process, and obtained calculating results are completely identical with calculating results obtained by using the probability sequence to carry out sequence operation. Meanwhile, the method is suitable for problem analysis with probability distribution similarity.