There are some monographic studies on the idea of Dharma-body and Dharma-nature by Hui-yuan and Daosheng in present academic circle. In the correspondence with Kumarajiva, Huiyuan’s special thought of Dharma-body was displayed, and the view which differed from Kumarajiva’s was also demonstrated in the discussion of stage of practice and the theory of interaction between Buddha and human being. All of the above-mentioned thought, was able to represent the comprehension of Buddhism at that time. A research on the shift of the idea from Dharma-body to Buddha-nature during Jin and Song Dynasties, not only help us to comprehend Daosheng’s special ideas more clearly, but also assists to examine the development of Buddhist thought in this period more correctly. In more specific terms, this transformation is manifested in the connection between Kumarajiva and Daosheng’s thoughts of Dharma-body, stages of practice and the theory of interaction between Buddha and human being. Therefore, a comparative study on the development of idea from Dharma-body to Buddha-nature is beneficial and meaningful to reinvestigate the history of Chinese Buddhism in the primary period.