The goal of foreign language teaching is to broaden the variety of communication settings in which the learner can concentrate on meaning without being distracted by linguistic form. Vocabulary is the center of language learning, so it is important to deal with the communication law in the application of vocabulary teaching. However, nowadays, in the college vocabulary teaching classes in China, students only passively accept the words, remember the meaning and form of words by rote, and lack the opportunity of application and communication. Therefore, applying CLT can promote the accumulation of the vocabulary which occurs more significantly in the real context.