With the development of teaching Chinese as a foreign language, the quantity of the student is increasing. Because of the lack of dictionary explanation or class teaching, they often misuse or mix them in face of the similar terms. In this thesis, “X sui” words are studied including “ban sui”, “gen sui”, “zhui sui” with multi-angle observations and made explanations from syntax, semantic, historical evolution and cognition. In the level of syntax, it’s found that “ban sui” is unique in several respects. In the level of semantic, “ban sui” expresses comitative relations of different things, “gen sui” and “zhui sui” express comitative relations of events. In the level of historical evolution, “zhui sui” firstly accomplished the word formation process, “ban sui” was last. In the level of cognition, the differences of “X sui” words are decided by their own subjectivity, the animacy of the nouns, and the two-way choice between the two mechanisms. This shows that human language has accepted the regulation and control of the cognition before copying the objective world. This discovery further enriches the previous studies on comitative verbs from the perspective of cognition, and will have a wider application and simplify the language analysis.