Traditional Confucianism has always continued its rich philosophy of natural law throughout its evolution.As an important representative figure in Southern Song Neo Confucianism,Zhang Shi's natural law thought summarized and innovated traditional Con-fucianism,mainly manifested in his transformation and integration of the pre-Qin Confucianism's mind ontology thought and the Song Dynasty's new Confucianism's Tai Chi ontology thought and Qi ontology thought.Based on this,through the absorption and reference of Buddhism and Taoism thought,Zhang Shi creatively proposed the integration of"heaven,nature,and reason"to establish a distinctive philosophical system of natural law,thereby making the ontology of the Confucian natural law view more refined,the content system more systematic,and the theoretical development more complete.The analysis of Zhang Shi's natural law ideology helps to gain a de-eper understanding of his transcendent,vitality,and innovative power.