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　　“Get up, boy, it is time to go to school.”

　　“I dislike having get up early. I can take an on-line lesson at anytime I like.”

　　It is a completely ordinary dialogue occurring in modern life. Yes, it is the com

　　puter, whose ever-accelerated updating brings about tremendous changes in our sch

　　ool lives. A typical application is Computer Assisted Instruction (CAI), which ai

　　ds teacher to impart knowledge to student more efficiently by it’s multimedia ch

　　aracters. However, a vigorous debate over the issue whether or not teacher are by

　　no means important in pedagogy field has intrigued the public. In my submission,

　　the computer can be great help of teacher but they can never replace or surpass

　　the position of teacher. I will offer the following reasons.

　　Firstly, CAI are designed and programmed by human instructor. They only condense

　　parts of teacher’s experience and intelligence. Moreover, being a successful ins

　　tructor requires not just these factors but a wealth of experience and interpret

　　new experiences using that information. The computer after all are man-made machi

　　ne.

　　Secondly, the progress of instruction is complicated and complex, and the educati

　　onal achievement of CAI is limited. Some sorts of course, such as basic education

　　al course( 想想什么课程用电脑教不好), are not necessarily to be expressed by the

　　computer to reach productive effect.

　　Finally, communications and interactions with teacher and computer are quite diff

　　erent. The latter is too impersonal, which ruins the pleasure of emotional exchan

　　ges. Sometimes gazing at the cold flickering screen is a disinteresting and tirin

　　g experience.

　　Admittedly, though computer may help teacher to provide student with a richer and

　　more effective learning environment, yet they can not substitute the position of

　　teacher, not only today, but the future.