From the end of 1940 to 194 1 May, Ma Jian served as the Minister of the Democratic Movement Department of Feinan County Committee. 194 1 August, a people's congress was held in Feinan County, and he was elected as the county magistrate and county captain. 1in July, 947, the Kuomintang troops attacked our liberated areas, and the county party Committee decided that non-combatants would move north of the Yellow River with the county party Committee. Mu Sen, secretary of the county party committee, and Ma Jian, the county magistrate, led the county armed forces department to cooperate with the 15th and 16th regiments of our main force, and persisted in the struggle behind enemy lines. In a month, they fought more than 20 times, wiped out more than 1000 homecoming, captured more than 400 people, and destroyed 10 pseudo-government organs. 1February, 948, transferred from the county seat, and successively served as the district head of the tenth district of Jinan and the squadron leader of the southern cadre column.

1May, 949, went south to Shanghai with the People's Liberation Army. On May 30th, he was appointed as the takeover commissioner of Miaoyi District and director of the district takeover committee by the Shanghai Military Management Committee of China People's Liberation Army. In June, after the establishment of Miao Yi District Party Committee and District People's Government, he served as the secretary of the district party Committee and district head. In the early days of liberation, the working people were unemployed and the market price was unstable. 1950, Ma Jian took the lead in organizing and establishing the Miaoyi District Working Citizen Cooperative at No.644 Fangbang Middle Road, dealing in daily necessities such as grain and oil, briquettes, local products from north and south, soap and towels. The funds will be raised by members and will be distributed at the end of the year. Members can enjoy preferential treatment when shopping with cards. 1in the spring of 950, Shanghai was attacked by air. Ma Jian led cadres to rescue the injured in Shiliupu, the hardest hit area, and organized air defense, public security and emergency repair in time. The spirit of working day and night moved the masses.

Ma Jian's life style is hard and simple, and he is strict with himself. His family lives in the dilapidated Guandi Temple on Fuxing East Road. Ma Jian declined the organizational proposal to bring his son from Shandong at public expense. Later, his son came all the way to Shanghai to visit relatives without using any public funds.

1956 Ma Jian was transferred to the post of Deputy Secretary of the Supervision Committee of Shanghai Municipal Committee. Persecuted in the "Cultural Revolution" and rehabilitated after the Third Plenary Session of the Eleventh Central Committee of the Communist Party of China.