Abstract: This article analyzes the teaching status of water treatment biology, a fundamental course in the field of water supply and drainage science and engineering, and identifies the difficulties and problems in the teaching process. It is found that there are problems such as weak biological foundation, lack of learning confidence, and lack of practical experience; Based on this, it is proposed to reform teaching content, teaching methods, teaching modes, etc., which will help improve students' self-learning ability, enhance interaction, stimulate learning interest, enhance learning effectiveness, and cultivate students'sense of social responsibility and national sentiment.

Key words: Water treatment biology, Teaching status, Organic integration, Innovation, Teaching model reform, Teaching quality improvement