Computer-assisted learning(CAI) is a new subject which is an over lapping area of computer science, pedagogics and psychology. It has become a topic for the modernization of educational technology. However, the present softwares for teaching purpose are far from adequate. They are simply duplication of the textbooks. Too much attention is paid to for their garish appearance and system atization and there is a lack of interactions. In order to raise the quality of the software, some principles must be setup for the technological needs and the programmers must be well trained. In addition team work for the development of software should be encouraged and the examination or evaluation system should be established.