Abstract:Water Treatment Microbiology, a basic course for the undergraduates majoring in water supply and drainage science and engineering, plays an important role in the cultivation of innovative talents in emerging engineering. In response to the problems in the theoretical teaching, practical teaching, and ideological and political teaching of this course, our group carried out teaching research and built a “2+2+N” teaching system for reform and innovation. The system includes visual teaching to consolidate theoretical foundations, innovation of the “pre class-in class-after class” teaching process to guide active learning, and integration of in-class and after-class competitions into the course to strengthen students’ practice and innovative capacity. In addition, the N-dimensional affinity is added to the course to guide the fostering of value. After teaching practice and continuous improvement, this course has been approved as a school-level ideological and political demonstration course, with one provincial educational reform project finished and five educational reform papers published in the past three years. It has received good feedback in terms of enriching the professional knowledge, improving the practice skills, and enhancing the research innovation capacity of students. This innovative system not only enables students to integrate into the classroom but also encourages them to step out of it, the students taught with this system have won third prize or above in seven national level discipline competitions. Moreover, this system helps to form a harmonious teacher-student relationship during the process of mutual communication, achieving entertaining and mutual teaching and learning between teachers and students. This teaching reform and innovation system can provide reference for the current teaching reform of engineering courses in local colleges and universities.