Abstract: In light of the misalignment between the current curriculum systems of academic undergraduate and vocational education for junior college and the core tasks of ecological environment on-site engineers, a research on construction of vocational undergraduate curriculum system is carried out. Through the analysis of the core tasks of ecological environment on-site engineers, such as the operation and maintenance of intelligent water plants, on-site construction of pollution control projects, operation and maintenance of ecological environment monitoring, ecological environment impact assessment and management, etc., the necessary vocational capabilities are generalized to construct the curriculum system. The curriculum system encompasses the public basic courses, specialty core courses, and on-site engineering project courses. Relying on the "Six-in-One" production-education integration practice center, through the school-enterprise joint establishment of a talent cultivation system led by technological innovation in environmental protection, high-quality technical and skilled talents who are "Proficient in operation, familiar with processes, competent in management, adept at collaboration, and capable of innovation" to meet the demands of on-site ecological environment projects are cultivated. The curriculum system will also undergo continuous improvement and innovative development along with the production-education integration and science-education convergence.