Abstract: The current situation in the South China Sea is extremely serious, inner countries strengthen control the disputes island , stepped up to grab resources, accelerate the pace of military expansion. At the same time，extraterritorial powers including actively involved, sought to halt the rise of China. The South China Sea area is becoming a global new wrestling games. So this article constructs a mathematical model, from the two perspective of history and current status, to measure out the evolution of Great Powers’ geopolitical influence on the South China Sea neighboring countries including Vietnam, Philippines, Malaysia, Brunei and Indonesia, and comparative analysis of the powers’ geopolitical influence on the South China Sea region. Assess scientifically the extent to the extraterritorial powers involved in the South China Sea issue. Provide decision for maker to support correctly judge the security situation in the South China Sea. We discover that, the history data shows Powers geopolitical influence on the South China Sea region substantially increased year by year, and the current result contributes to guide Chinese foreign policy decisions with the South China Sea neighboring countries and the extraterritorial Powers.