ABSTRACT Political parties are considered the basic institutions in a representative democratic system. It engaged the party members through internal and external party activities. The members of established political parties have gained more power to select candidates and party leadership in developed democracies. Pakistan is a developing democratic country; Pakistan Tehreek-e-Insaf announced an intra-party election in 2012 to elect candidates for the general election 2013 in Pakistan. However, it is a fact that intra-party participation promotes equality and increased vote bank, party membership and turnout in general elections. The main aim of this paper is to examine the consequences of the intra-party election of Pakistan Tehreek-e-Insaf held in 2012. Hence, this study concludes that the membership and vote bank of Pakistan Tehreek-e-Insaf has increased, grass-roots members promoted through proper channels and many candidates elected first time as members of parliament, as well as impacted the turnout in general elections of Pakistan. This study is an attempt to examine the impact of intra-party elections on the party membership, vote bank and turnout in general elections held in Pakistan before and after this intra-party election.