In order to collect necessary information for comprehensive evaluation more availably, presents a teaching evaluation method based on constrained bad item. This method is divided the teacher’s teaching quality into four grades: “excellent, good, medium and bad”, which has one evaluation item of each teacher can’t be excellent at least. Analyze degree of students’ logos and relative reliability of evaluation items by utility theory in detail. Use fuzzy math and multi statistical method to evaluate the teachers’ teaching comprehensively. The results indicate that this method can avoid weighing subjectivity, and it is more objective and reasonable.