The teaching mode of problem-based learning ( PBL) can train the students ’ abilities of finding and solving problems , but it is difficult to widely implement it in our country due to less class time , imperfect evaluation system , and lacks of teachers and their knowledge structure .Fitting well in the present circumstances , case-based teaching interspersed with PBL teaching , will be more con-ducive for students to grasp systematically the basic medical knowledge , to mobilize their enthusiasm , and strengthen the cultivat...