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1. Introduction
In the introduction， vocabulary and grammar were called the building blocks of language. More precisely， vocabulary words and phrases are the building blocks and grammar is the glue that holds them together. Grammar lets you know who chased whom when you hear， “The dog chased the cat.” Your knowledge of English grammar tells you that the first animal metioned in the sentance did the action. But your knowledge of English vocabulary allows you to interpret what the dog is， what the cat is， and what they did. In fact， vocabulary is the most important aspect of language for students to learn.
1.1 Background
Most researchers today agree that English language learners need to spend time and effort studing vocabulary. They point out that learners need to spend time and effort studying vocabulary. They point out that learners do not have sufficient exposure to words in the English that they hear and read. Moreover， when learners encounter unfamiliar words， those words often remain unknown unless students get help from a teacher， a dictionary， or a computer.
1.2 The Purpose of the Paper
This paper attempts to explore the effectiveness of teaching vocabulary based on CALL in senior high school so as to adapt to the trend of English teaching reform， facilitate the up-to-date concept of English teaching.Therefore， it is quite crucial to create a vivid environment. A good method is resorting CALL. It will offer different styles of listening experience to the learners in contrast to traditional one.
2. Literature Review
In this part， some key concepts of CALL and some relevant researches of teaching English vocabualry by using CALL will be introduced， as well as relationship between CALL and SLA.
2.1 The Definition of CALL
Levy （1997） defined Computer-Assisted Language Learning （CALL） as “the search for and study of applications of the computer in language teaching and learning” （Levy， 1997， p.1）. Although the name includes “computer”， the term CALL embraces any applications of Information and Communication Technology （ICT） to teaching and learning foreign languages. Two different terms such as CALI （Computer-Assisted Language Instruction） and CAI （Computer-Associated Instruction） was used instead of CALL before the early 1980s （Davies