On the basis of the analysis of the current situation of German as a second language teaching at medical colleges， this paper argues that the mode of communicative approach should be systematically constructed in an all-round way with the flexibility for teaching approaches taken according to the content modules such as the situational approach in the stage of oral practice learn-ing， the practice and comparative learning in lexical and grammatical learning， the performance-based learning in the stage of cross-cultural learning. And finally， through a multi-level evaluation method， the implementation of the teaching objectives should be carried out to strengthen the medical students' cross-cultural ability and humanistic quality.