The sentence format (SF) indicates the relationship among the components of the sentences, and it also can provide guiding knowledge for computer sentence processing. The sentence format is used to indicate the appearance order of the main semantics block in the sentence. The method manifested the language expression custom of the language and the synthesis utilization of each grammar category. The integrity description of the language complex sentence pattern phenomenon is described through the combination of the sentence format research and the sentence category research. The format research is advantageous to improve the analysis level of the computer sentence category processing. This paper gives the sentence format system in Chinese and provides the coding way. The results of test indicated that the information benefits the computer processing in NLP area.