With the advances in information technology, fragmentation mobile learning is becoming increasingly popular. WeChat public platform and mobile micro learning shows good match, which can satisfy the needs of college English autonomous learning. We build a mode by using WeChat public platform to assist college English teaching, then use a method of questionnaires and in-depth interviews to conduct an empirical study of this model. And the results show that the mobile micro-learning is a useful supplement to classroom teaching; finally, this paper proposes WeChat public platform can aid college English teaching. With the rapid development of network and information technology, the traditional education pattern has been greatly influenced by informationization tide. China Internet Network Information Center (CNNIC) in Beijing issued “the 35th China Internet network development state statistical report”, showing that up to December 2014, there are 557 million mobile Internet users in China, accounting for 85.8% of the total number of Internet users. The popularity of smart phones and the rapid development of mobile Internet, WeChat, Weibo and other learning technical support, provide a possibility for people to do mobile micro learning.