The 1973 constitution of Pakistan was adopted on April 12, 1973. This constitution fully represents the ideology and democratic aspiration of the people of Pakistan and constitution is the supreme law of the land and it is considered as an instrument by which a Government can be run. It replaces the basic laws of the state. it decides the attributes of the government and provincial Govt. in constitution is federal cum parliamentary in its characteristics. The constitution of Pakistan is based on principle of tracheotomy of power. It is a social contract which binds people, society and a state to act within the framework of the constitution.