The course on Biology of Water Treatment in application-oriented universities is faced with some difficulties.Firstly,the course objective is not clear.Secondly,the teaching is not closely related to the major.Thirdy,there is more content and less class hours.Fourthly,knowledge imparting is more important than ideological education.In view of the above problems,we have taken the following four reform measures:firstly,we have made clear the course objectives and established a link with professional development;secondly,we have reorganized the te...