In the second issue of world history in 2021, Xiong Yuezhi wrote that there are two different types of international links in modern Shanghai: one is external relation, that is, the direct links between Shanghai and Britain, France, the United States, Russia and other countries and their cities; One is embedded relation, which is connected with relevant countries through concessions. Most of the time in modern Shanghai, there were two concessions, and the municipal management was in the situation of one city and three governance bodies. There were great differences among administrative entities in political system, judicial system and values, which led to many weak areas and gaps in management in Shanghai. Comintern set up the East Asia Secretariat in Shanghai, the Communist Party of China was born in Shanghai, the central organ of the Communist Party of China has been located in Shanghai for a long time, and takes Shanghai as an important activity base. Comintern and the Communist Party of China consciously took advantage of the management gap caused by Shanghai's concession to carry out revolutionary struggle, and the workers' and peasants' Red Army took advantage of the weak management areas formed in the border areas of relevant provinces to establish various border red regimes. They are both the understanding and utilization of the imbalance and contradiction of things.