Abstract: In order to do the same distribution test for sea target detection accuracy, a statistic analysis was carried out for onsite target detection data. The result indicates that many error data conform with the same distribution or the same normal distribution. In comparison with the method χ2 test, the symbol test and the sum of order test, it is concluded that χ2 test is suitable to the same distribution test for sea target detection. A series of tests indicate that if a reasonable confidence level is selected, the voyages necessary for testing are decreased to 10%～50% of the original voyages. The test method can improve the confidence and accuracy of the test data, shorten the test period, and expand the application of weapon test for data processing and analysis.