The paper analyzes 33 grammatical structures of Tsinghua University 973 Treebank from the syntactic point of view. Firstly, we explore the distribution of these structures in Tsinghua University 973 Treebank and analyze the syntactic constituents of these structures. Then, we gather statistics about these structures based on the external functional relation and the internal structural relation of its subcomponents. Finally, according to the same internal structural relations, we generate a matrix to show the ambiguity among these structures. The statistical data offers the syntactic knowledge for auto-identifying these structures in future use.