B. N. Rau was named as the Constitutional Adviser to the Constituent Assembly in planning the Indian Constitution in 1946. He was in charge of the general structure of its vote based system of the Constitution and arranged its underlying draft in February 1948. This draft was talked about, changed lastly embraced by the Constituent Assembly of India on 26 November 1949.

On 14 August 1947 gathering of the Assembly, a proposition for shaping different boards of trustees was exhibited. Such boards incorporated a Committee on Union Constitution Committee, Fundamental Rights, and the Union Powers Committee. On 29th of August 1947, the Drafting Committee was selected, with Dr. B. R. Ambedkar as the Chairman alongside six different individuals helped by an established counselor. These individuals were Bombay), Pandit Govind Ballabh Pant, Alladi Krishnaswamy Iyer (Ex-Advocate General, Madras State), N Gopalaswami Ayengar (Ex-Prime Minister, Kanaiyalal Maneklal Munshi (K M Munshi, Ex-Home Minister, D P Khaitan (Scion of Khaitan Business family and an eminent legal advisor), J&K and later individual from Nehru Cabinet), B L Mitter (Ex-Advocate General, India), and Md. Saadullah (Ex-Chief Minister of Assam, Muslim League part). The established counsel was Sir Benegal Narsing Rau (who turned out to be First Indian Judge in International Court of Justice, 1950– 54). Later B L Mitter surrendered and was supplanted by Madhav Rao (Legal Advisor of Maharaja of Vadodara). On D P Khaitan's passing, T Krishnamachari was incorporated into the drafting advisory group. A draft was set up by the board and submitted to the Assembly on 4 November 1947, which was bantered about and more than 2000 corrections were moved over a time of two years. At long last on 26 November 1949, the procedure was finished and the Constituent Assembly embraced the Constitution. A total of 284 individuals marked the record and the procedure of constitution-making was finished. This day is commended as National Law Day or Constitution Day.

The get together met in sessions open to the general population, for 166 days, spread over a time of 2 years, 11 months and 18 days before embracing the Constitution, the 308 individuals from the get together marked two duplicates of the record (one each in Hindi and English) on 24 January 1950. The representations on the cover and pages speak to styles from the distinctive civilizations of the subcontinent, going from the ancient Mohenjodaro civilization, in the Indus Valley, to the present. Prem Behari Narain Raizda finished the calligraphy in the book. It was distributed in Dehra Dun and photolithographed at the workplaces of Survey of India. The whole exercise to deliver the first took almost five years. After two days, on 26 January 1950, the Constitution of India turned into the law of the considerable number of States and domains of India. Rs.1,00,00,000 was legitimate gauge of consumption on constituent get together. It has experienced numerous alterations since its institution.

The first 1950 Constitution of India is safeguarded in helium cases in the Parliament House, New Delhi. There are two unique forms of this – one in Hindi and the other in English.