After the fall of Shanghai, Du refused to defeat the Japanese and moved to Hong Kong in June+10. In Hongkong, he served as the vice president of China Red Cross Society, the standing committee member of the Relief Committee, and the chairman of the Shanghai Municipal Committee for the Unification of Party and Government, engaged in activities such as intelligence and plotting to assassinate traitors. One of the most famous is that his disciples in Shanghai helped the secret service to hack to death the great traitor and the pseudo-Shanghai mayor Fu Xiaoan.
After the fall of Hong Kong, Du retreated to Chongqing, and continued to preside over the meeting work of the Red Cross Society, dealing with front rescue, rear air raid rescue and medical rescue. At the beginning of the liberation of Shanghai, Chiang Kai-shek summoned Du alone, hoping that he could go to Taiwan Province Province with himself. Our party also met Du secretly, hoping that Du could stay in Shanghai. After some struggle, I finally decided not to go to Taiwan Province Province or stay in Shanghai, but chose to go to Hong Kong and finally settled down in Hong Kong.
Du Yisheng silently helped the people of China, expecting nothing in return, with a patriotic heart.