The　paper　introduces　the　major　defects　and　its　causes　of　solid　rocket　motor,　the　harm　and　effects　of　the　combustion　chamber　defects　for　the　stability　of　motor　were　clarified,　the　main　methods　and　their　advantages　and　disadvantages　of　defect　detection　currently　used　in　solid　rocket　motor　are　also　cited　and　analyzed,　and　it　points　out　the　developing　trends　about　various　of　detection　technology　used　in　conjunction.