College English teaching in China is an essential part of the whole education system, but there have been some problems that students have been undergoing with low efficiency and instrumental motivation, and that their language input is confined in what teachers taught. In order to solve the problems, this article designs a test and collects data to check the effectiveness of the task-based approach within the Internet-assisted multimedia in college English teaching. The results show that Linguistic form was analyzed and practiced with task-based approach which may help the learners notice the linguistic problems and try out new language forms and structures, and that Internet-assisted multimedia has been effective in intriguing learners' interests and greatly enhanced their self-esteem.