With the rapid development of network and information technology, cloud computing has become a frontier subject in today's world. Cloud computing is a new Internet service model, with a broad application prospects. Cloud computing provide a new way of thinking and development opportunities for the construction of information technology in colleges and universities. This paper first elaborates the concept, characteristics and deployment mode of cloud computing, then analyzes the key technologies related to cloud computing, and finally discusses the application of cloud computing in educational informatization.