Mainland China since its economic reform has become one of the countries that attract most foreign investment, which brought significant influence on China¡¦s economic development. However, the foreign investment has a highly unbalanced distribution within China, with the coastal area absorbing more than eighty per cent of the total amount. The uneven distribution exacerbated the development disparity among different regions. In an effort to address the regional development gap and ameliorate inland economic development, central government in China put forward the Western Development Program in 2000. This paper seeks to analyze the impacts foreign investment brought to west China, by examining China¡¦s foreign investment policy since its economic reform, and its Western Development Program since 2000, respectively. The research concludes that as economic reform began in China¡¦s eastern area, the region benefited from government¡¦s favorable foreign investment policy and advanced its economic development. Western area, on the contrary, demonstrates otherwise. The Western¡¦s Development Program failed to attract substantial foreign investment into inland China, and the preferential policies for foreign investment had only very limited success. This is due to a range of factors taken into consideration by foreign investors when contemplating operating in the western area, including the infrastructure and the investment environment in west China. As such, government¡¦s preferential policies remain ineffective and the distribution of foreign investment continues to be highly asymmetrical.