Based on the promotion of the new college entrance examination reform policy, the selection of subjects is more closely related to the selection of university majors and career directions. High school students' decision-making on subject selection not only affects their subsequent studies in the high school stage, but also means that they have also made choices about majors and vocational directions. Therefore, whether high school students have a clear understanding of themselves and the vocational world at this stage, and whether they can establish the identity between those will affect their decision-making. Vocational identity is the embodiment of self-identity in the professional field. In order to better study the career development of high school students, this research will start from the perspective of vocational identity, revise and intervene in the questionnaire of vocational identity of high school students, so as to help high school students to reduce decision-making difficulties.

This research is divided into two parts. In the Study 1, the Vocational Identity Questionnaire for senior high school students was revised. Study 2 is based on Study1，and hopes that curriculum intervention will improve the vocational identity of high school students.

The main conclusions are as follows:

(1) Under the background of the new college entrance examination, the Vocational Identity Questionnaire for senior high school students was revised and tested for its reliability and validity. The results show that the the Vocational Identity Questionnaire for senior high school students has good reliability and validity, and can be used as a measurement tool for the vocational identity development level of high school students. the Vocational Identity Questionnaire for senior high school students is divided into four dimensions: Self-knowledge, Vocational World, Major and Vocational Decision-making, and Subject-choice decision-making. Each dimension has 4 questions and a total of 16 questions, all of which are positively scored.