Abstract: The contents of principles, application scopes, terms, definitions and so on in standard ISO 527:2012 for tensile property testing of plastics were expounded and compared with those in ISO 527:1993. The results show that:compared with ISO 527:1993, ISO 527:2012 had been greatly revised in aspects of requirements of apparatuses precision, specimen size, testing speed and so on. The standards should be distinguished to apply when the tests of tensile properties of plastics were carried out.