Evaluating students'scientific proof ability is an important research direction to explore students' subject ability and its advancement, and to investigate the effectiveness of relevant courses and teaching. Demonstration in SSI is the application of scientific knowledge, scientific methods and scientific thinking in complex situations.<br>This study investigated the ability of 184 secondary vocational school students in grade two of nursing school in social chemistry topics in the form of questionnaires. The results show that: 1. The overall level of argumentation ability of 95% of secondary vocational school students in social chemistry issues is at a low level. Few students can complete a relatively complete argumentation process, and few students reach a high level of argumentation. 2. Vocational school students can construct their own arguments by putting forward advocacy dimension and giving reason dimension in each sub-competence level of argumentation ability in social chemistry issues, but in turn, they perform worse and worse in the scores of putting forward counter-argument dimension, giving evidence dimension and giving supportive argument. 3. there is no significant difference in the overall level of argumentation ability between three different social gender subjects in different gender. However, the total score of girls in the questionnaire and the total score of each topic are higher than that of boys, that is, the level of female students'argumentation ability is slightly higher than that of boys' argumentation ability.<br>According to the results of the survey, there is a great room to improve the argumentation ability of secondary vocational students in social chemistry issues. It is suggested that secondary vocational educators should attach importance to the argumentation teaching in chemical education, actively create SSI teaching situation in the classroom, select appropriate teaching modes and strategies, and attach importance to cultivating and improving the argumentation ability of secondary vocational students in teaching.<br>
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