With the deepened advancement of educational information, the rain classroom has been introduced, which endows the blended teaching with richer connotation, and further promotes the teaching reform in Colleges and universities. Blended teaching mode based on rain classroom integrates network information technology into traditional teaching process, which can realize the organic combination of dual-channel teaching including The application of rain classroom in undergraduate course teaching of science and engineering has remarkable effect in solving such problems as tedious classroom, large amount of notes, heavy task of correcting homework, formality of assessment, difficulty of quantification, and contradictions between less teaching hours and more content of courses, more students in class and lack of interaction between teachers and students. But in practice, there are still many problems: for example, excessive reliance on the network and smart phones and other equipment, the speed of the network, expensive traffic fee, and the quality of smart phones will directly affect the user experience, which is more prominent in the underdeveloped western universities, and extra energy input of teachers and teaching-hour subsidy do not match, resulting in weaken the enthusiasm of blended teaching. It is recommended to gradually improve from technical and institutional guarantees to truly promote education reform.