Abstract: By clarifying course objectives, designing module contents, innovating teaching methods and establishing evaluation system, modular teaching can effectively improve teaching effect and students'learning interest, and strengthen students’ practical ability. This paper introduces the construction process of modular teaching in detail, including four modules: basic theory, experimental skills, case analysis and production practice, and puts forward the implementation of safeguard measures, including strengthening the construction of teachers, integrating and optimizing teaching resources and deepening the cooperation mode between schools and enterprises, so as to ensure the smooth implementation of modular teaching and achieve good results.

Key words: Higher vocational colleges, Aquaculture water chemistry, Modular teaching, Practical exploration, Teaching reform, Industry-teaching integration