Social law is not a department law in ancient times, The academic circles believe that since the beginning of 20th century, especially after World War II, with the malfunction of “invisible market hand” and with the seriously deepening of social risk and economic uncertainty, social law rises based on this. Based on Polanyi’s “Double Movement” theory, by combining law development logic from form law to practice law, this paper analyzes and discusses the deep influence of “Double Movement” on modern society, and finally draws the conclusion that Polanyi’s “Double Movement” theory plays irreplaceable role in the rise of social law. It is really embodied that the modern social law with the pursuit of practical justice is discovered and rise from “Double Movement” in order to offset the deficiency of form style law and with the increasing of social risk. The logic starting point and theoretical core of modern social law are decommercialization idea of labor revealed in social protection movement for countering market expansion , the recognition and implementation for social self-protection instinct is initial form of social law system, in other words, is the pioneer of social law system.