The ‗One Belt One Road‘ term refers to ‗The Maritime Silk Road and the Silk Road Economic Belt. This mega initiative was announced by Chinese president, Xi Jiping, in September 2013 during his official state visit to Kazakhstan. Pakistan is most important pillar of this Chinese initiative. Under the One Belt One Road framework, several corridors will be built in future. Whereas, with the development of OBOR, regional economies will boost up to $2.5 trillion and more than 4.4 billion population will get benefits across 65 countries. The Silk Road Economic Belt will link China, Central Asia, Russia, and Europe through the Persian Gulf and South East Asia and Indian Ocean. However, China-Pakistan Economic Corridor will be built to connect the Pakistan's Port Gawadar with Chinese city of Kashagar in autonomous province Xinjiang. The China-Pakistan Economic Corridor project is a game changer for the region and particularly for China and Pakistan, through the development of roads, railways, oil and gas pipe lines. Thus, the project brings wealth and prosperity across the region, particularly in Pakistan. But on the other hand, Pakistan is facing serious internal and external threats from terrorism and extremism since 2001. This work is an attempt to enlighten the prospects of China-Pakistan Economic Corridor (CPEC) and constraints in the way of this mega projects.