Abstract: The important points of the expansion test (free expansion rate, expansion force, lateral restraint expansion rate, and collapse resistance) in several kinds of engineering investigations are discussed from the perspective of laboratory tests. The field sampling, standard sample preparation, test operation and method selection are discussed. Through the summarized methods, the test error could be reduced, the test level of expansive rock could be improved, the accuracy of test results could be guaranteed, and the method of measuring expansion index of expansive rock could be improved.