摘要：Vocabulary instruction is a vital part in English teaching.The paper sorts out four types of errors related to the usage of words based on the analyzing of some college students’writing assignments.And some suggestions are given based on the analyses on the classroom vocabulary instruction.First,a teacher should design proper tasks in class as well as after class to help students facilitate their vocabulary acquisition.Second,the errors committed by students should be analyzed systematically.The teacher should make students notice their errors and master the usage of these words.