1933 participated in the "Nanjing Reading Club", a progressive organization hosted by Wang Kunlun, and supported progressives who advocated resisting Japan and saving the country to carry out anti-Japanese activities. 1937 after the outbreak of War of Resistance against Japanese Aggression, Wu maosun served as the secretary of the political Committee of the seventh war zone, leading a group of exiled students from Peiping and Tianjin to form a task force to carry out anti-Japanese and national salvation activities in the Sichuan army station in Shexian county, Anhui province. At the same time, he participated in the preparatory work of the Sino-Soviet Cultural Association and served as the head of the data group. 194 1 After the "Southern Anhui Incident", Wang Kunlun, Wang Bingnan and others organized and established the "China Democratic League" in Chongqing, with Wu Maosun as one of the founders. 1945 was elected as the formally established member of the Central Committee of the Three People's Principles Gay Federation.

From 65438 to 0947, Wu Maosun went to Columbia University to study international relations. At this time, the Kuomintang-Communist peace talks broke down and a full-scale civil war broke out in China. He devoted himself to the democratic movement against American civil war, dictatorship and treason. 1948 1 month, the Revolutionary Committee of the Chinese Nationalist Party was formally established in Hongkong, and then the branch of the Revolutionary Committee in the United States was established in new york. He was elected as an executive member by the above two organizations. On February 6 of the same year, Li Congxiang, Chairman of the Central Committee of the Chinese Revolutionary Committee, entered the Northeast Liberated Area. 1949 1 month, he participated in the declaration on the current situation made by 55 people headed by Li, Shen Junru and Guo Moruo, and said wholeheartedly: "I am willing to make joint efforts under the leadership of the Communist Party of China, with a view to the rapid success of the people's democratic revolution in China and the early realization of an independent, free, peaceful and happy new China." Mao Zedong replied: "Mr. Zhu has worked hard for the cause of democracy for a long time, and now coming to the liberated areas will surely make the common cause of building a new China a rapid success." Later, he participated in the preparatory work for the new CPPCC and attended the first plenary session of the China People's Political Consultative Conference.

Since then, Wu Maosun has served as vice chairman of the Foreign Affairs Committee of the National People's Congress, counselor the State Council, secretary-general and vice president of the Chinese People's Institute of Foreign Affairs, member of the second Central Committee of the Chinese Revolutionary Committee, member of the third and fourth Central Standing Committees, vice chairman of the fifth and sixth Central Committees, and director of the sixth Central Executive Board. He is a deputy to the Second and Third National People's Congresses, a member of the Sixth the NPC Standing Committee, a deputy director of the Foreign Affairs Committee, a member of the Second China People's Political Consultative Conference, and a member of the Standing Committee of the Fifth China People's Political Consultative Conference. At the same time, he also served as deputy secretary-general and executive director of China People's Committee for Defending World Peace, director of China Foreign Cultural Association and executive director of China African Friendship Association. He has been to eastern Europe, western Europe, Japan, the United States and some third world countries to attend international conferences.