It was only in 1975 that the virtue of the enactment of 37th Constitutional Amendment Act 1975 that the Pradesh Council was constituted as a separate Legislative Assembly and Lt. Governor was appointed as the head of the Union Territory of Arunachal Pradesh. The Pradesh Council became provisional Legislative Assembly having 23 members during 1975 to 1978. The first elected Legislative Assembly consisting of 33 members (30 elected members and 3 nominated members) was formed on 4th March 1978, which lasted only for about 20 months. In November 1979, the Assembly was dissolved and President’s Rule was imposed which continued till January 1980.

The Second General Election was held in January, 1980. The Third General Election for Legislative Assembly was held simultaneously with the General Election for the Eighth Lok Sabha in December, 1984 and the Assembly was constituted in January, 1986.

The Union Territory of Arunachal Pradesh became full fledged State with effect from 20th February, 1987. On the persistent demand of the people of the State, the total membership in the Legislative Assembly was raised to sixty during the General Election in 1990 and thus, the First Legislative assembly of State of Arunachal Pradesh was constituted.

Fourth Election to the Assembly was held in March, 1995; That was the Second Legislative Assembly of Arunachal Pradesh. The Second Legislative Assembly was dissolved by the Governor on 27th July 2000, ahead of schedule in March 2000. The third Legislative Assembly headed by Shri Mukut Mithi was constituted in October 1999. From August 3, 2003, the Government is led by Shri Gegong Apang. Now, people of Arunachal Pradesh are represented at the Union Government by one MP in the Rajya Sabha and two MPs in the Lok Sabha.