The method preparing lessons according to every chapter is put forward because the traditional method preparing lessons accrding to every section had some disadvantages.

It is primary link in the teaching course to prepare lesson.

Experience of preparing lessons and teaching in clinical medicine teaching;

Teaching effect and quality of genetics experimental course will be improved through preparing lessons together,enhancing pre－ experiment and using elicitation method of teaching.

The author expounds the function of preparing lessons in colleges and universities from many respects,such as the roles of the teachers and students,the important contents of the process of preparing lessons and the method of it,which is the key link of influencing the quality of PE teaching.