Abstract: The online and offline mixing teaching mode has become the vocational education informational teaching reform direction. However the higher vocational engineering courses are not very fit to this mode. According to the engineering course features and the student study features in higher vocational colleges, it constructs the “Four-Step Method”teaching mode of “detecting horses before class-learning activities-test after school-job submission. After verification in the Small Hydraulic Structure Design, this mode was conformed that it has positive effect on improving student interest, participation and teachers’teaching level. It also provides reference for informational teaching reform of higher vocational engineering courses.