According to previous researches, Chinese four-word idioms are difficult to teach and learn. Chinese as second language learners usually avoid using idioms or make various errors. This article examines the issue of how to use contexts and scenarios to teach and practice idioms in an idiom course, then investigates the products written by the learners, which are based on scenarios composed by the teacher. The results show that all the learners acquire high frequencies and correctness in their writing assignments.