Based on Bloom’s theory of educational classification goals and guided by the promotion of problem-based thinking, a comprehensive experiment is designed according to the project-based teaching method. The proportional valve experiment is taken as an example to analyze the whole process of the experiment. In the experiment, students design a feasible experimental scheme, including the design of the hydraulic system schematic diagram, the design of the signal transmission and control system, the preparation of feasible experimental steps, and the analysis of the experimental results. After several years of teaching practice, the teaching concept based on the improvement of question thinking ability is helpful to improve students’ innovation ability.