Language input ，output and their relationship have been topics of heated debates in the field of Second Language Acquisition． The Interaction Hypothesis offers a promising way to optimize the roles of input and output by their mutual interac- tion ，in light of which the “College English Module-Specific Class Teaching Model ”has been designed． The basic practice is di- viding college English class into four modules : speaking ，writing ，fast reading ，and extensive automatic learning． With prominent focus on output and its interaction with input ，the reform is proved successful by efficiently improving students ’communicative a- bility．