He was one of the representatives of the committee of the Round table conference led by Sheikh Mujibur Rahman In 1970 he was elected to the Pakistan National Assembly.

After the election of 1970, He was chosen as the victorious party whip in the parliamentary committee formed by Sheikh Mujibur Rahman.

[3] He was made the First Minister of Home Affairs of Bangladesh on 12 January 1972 in the Sheikh Mujib cabinet.

Abdul Mannan was appointed as the Health and Family Planning Minister on 26 January 1975.

He helped establish Mawlana Bhashani Science and Technology University, and the Wari Club.