The internet-assisted blended teaching is an effective way to promote the rapid and high-quality development of education and promote the progress of education.In this paper, the teaching reform of the course “Building Cooling and Heating Source” was carried out and the online and offline blended teaching mode based on the Rain Classr Platform was explored. The traditional teaching mode was reformed from the three aspects of curriculum training mode reform, process training optimization and achievement evaluation mode construction.This paper explores the main ways of the blended teaching and training system of "Building Cooling and Heating Source", exercises and cultivates students' autonomous learning ability, in order to provide reference for strengthening the discipline construction and deepening the teaching reform.