Abstract: Under different prepositions,content prepositional phrase contains sentence can be divided into two types of words sentence which conclued of "ba" and "the use of";The former by contains the matter object whole to move ahead or the fission moves ahead produces,the latter can only by contain the matter object whole to move ahead produces.These two kinds sentence is different becanse that Syntax and semantic characteristic of predicate and verbes predicator has discrepancy,other syntactic component in the syntax,the semantic mutual choice and matches,has its own characteristic,also different sentence buliding mechanism.