In the study of Spring and Autumn in Song Dynasty, Cheng Yi played an important role as a connecting link between the preceding and the following, and had a deep influence on Hu Anguo. Through the comparison of two Spring and Autumn Annals, we can see the successive relationship between Hu’s and Cheng’s. Especially in such aspects as the natural justice, righteousness and benefit, relations beteen foreign countries and China, emperors and subjects, Hu Anguo has extended more and elaborated further. Though the outline of Hu Anguos Spring and Autumn Annal is based on the study of Cheng Yi, it not only has deepened the meaning on the basis of Cheng Yi’s, but also is even more sophisticated and rigorous, which is much better than the former.