In Chinese-English machine translation, the treatment of a complex sentence mus t not only depend on the individual clauses, but also review deeply the internal relation among the clauses in the complex sentence. In Chinese, there are lots of descriptive sentences with non-coordinating relation without certain languag e marks. To distinguish the internal relation among them and get the right Engli sh output from Chinese-English Machine Translation System, the integrated rules to distinguishing them are presented, and the method of judging dynamically the main clauses is put forward to solve the problem of localization of some rules. Finally the rules are verified in virtue of the experimental system.