In the classroom teaching,teachers use weak generalization to introduce new knowledge and use the strong generalization to consolidate that. The experienced teacher pays more attention to the weak generalization than the new teacher. Both of the teachers spent time on strong generalization's teaching is more than the weak generalization's teaching,and the experienced teacher pays more attention to the new knowledge's explanation. Both of the teachers' teaching lay special emphasis on teacher's explanation in the weak generalization and lay special emphasis on student engagement in strong generalization. The strong generalization's teaching by the refined explanation and exercise and the new knowledge's introducing by the weak generalization's teaching are conducive to execution the positive transfer of learning.