After 1990s, South Asia has been attached importance by international main countries, especially America and China, since it has not only important geographic location, sustainable economic growth and India’s rise, but also main issues such as India-Pakistan nuclear tests, Afghanistan anti-terrorism wars etc. As Bin Laden was killed, America adjusted its relations on India-Pakistan from “balancing between India and Pakistan” into “approaching India and alienating Pakistan”, also proposed “rebalancing policy in Asia” and “the new silk road project” in order to pin down China. China correspondingly promoted “the belt and road initiative” and planned “China-Pakistan economic Corridor” in South Asia to strengthen cooperation with Pakistan. This paper has used “network power theory” to analyze the China-Pakistan economic corridor’s influence on South Asia’s power structure and the result is as follows: First, China has united Pakistan to form another big power in South Asia through this corridor, which made America lose control of Pakistan. Second, Pakistan has not only gained a good chance for developing, but also raised its power in South Asia, India has to consider Pakistan while execute its hegemony power. Third, China-Pakistan economic corridor might break India(supported by America)’s only local big power, South Asia will receive a power balancing between India and Pakistan(supported by China), and this area’s power game might become more fierce.