To improve the practical effect of an information system security course for students majoring in information security, a teaching method based on the theory of inventive problem solving (TIPS) that combines case-based teaching and project practice was introduced in the class. Adopting innovative thinking methods, we instructed students on the projects and goals of curriculum design. Using TIPS tools, the students completed complex projects. To test the teaching results, we examined 121 students who received case-based teaching using the TIPS method to design innovative projects. Quantitative data were collected using a statistically analysed anonymised questionnaire, while qualitative data collected from student reflective reports were thematically analysed. Through the in-depth development involved in the teaching of this course, their thinking and problem-solving ability significantly improved. The teaching effect evaluations indicated that this teaching method effectively improved students' practical abilities. This method was found to be conducive to planning students' future careers.