Current research about the recognition of the relational word is mainly concentrated in literal features, the research refer to syntax analysis was relatively minority. Based on the constraint conditions of Chinese complex sentence relational words' collocation which was on account of literal characteristics, this paper studied the constraint conditions research which were based on the dependency relation, it used five axioms of dependency grammar for analyzing relation words' dependency relation on Chinese complex sentence, and summarized seven kinds of constraints, then formalized these cons...