In　order　to　introduce　the　study　on　automatic　composition　of　knowledge-based　semantic　Web　services,　we　expend　the　traditional　knowledge-based　analysis　system　and　sum　up　the　analysis　system　as　deviation　problem.　This　paper　also　provides　the　solving　framework　for　dealing　with　the　deviation　problem　in　semantic　Web　services　composition,　and　a　simulation　experiment　achieved　on　WSMO　platform　shows　that　it　could　be　better　in　utilizing　the　information　of　knowledge　store　and　enhances　the　automatic　composition　of　Web　services　in　deviation　problem.