In order to enable students to understand various technological processes in Environmental Engineering course,and be able to use them flexibly,training in ecological concept cultivation,engineering application,social practice,innovative design,and other aspects are emphasized in teaching process.The cultivation and innovation of student's learning methods and abilities are stressed.Taking biological nitrogen removal as an example,class-room teaching reform is carried out in aspects of teaching analysis,teaching design,teaching methods and teaching assessment so that students can apply what they have learned and have strong practical ability and creative ability.