Abstract: Conformance test selection is a very important stage in conformance test. Test suite from test generation can't be suitable for practical test because of test cost, coverage, availability etc. best selection is necessary to generate subset of test suite. We gave a method to carry out test selection based on statistical test. It included three stages. The first was to construct acceptance region using formal method. The second step was to sample test execution and count the number of success. hhe last was to judge the availability of test case based on whether the number of success lie in acceptance region. The method has been used in our test selection application.

Key words: Conformance test, Lest selection, Acceptance region, Sample, Availability