Recognition of relation category is screening for semantic relation of clauses in a compound sentence, and it is the key to analyze semantic relationships of Chinese compound sentences, Most of Chinese compound sentences have two or three clauses and compound sentences with three clauses can be divided into two clauses. Therefore, the study of compound sentences with multiple clauses comes down to the study of compound sentences with two clauses. This paper described a study of non-saturated compound sentences with two clauses, using syntactic theory and the collocation theory of the relation ...