Cambodia is one of the oldest and the most trusted of China’s alliance. Chinese foreign assistance has influenced in interests of politics, strategics and economics. This article seeks to explore the close interaction of China’s foreign financial aid influences and contributions in respect to economic infrastructure development on economic growth. Methods: Using in-depth interviews with twelve key experts’ participants are conducted and transcribed by the author. The data analysis is employed thematic analysis and using Nvivo 10 are used to analysis, all interviews are transcribed by the author number of codes in systematic way by reducing data from the codes and then develop themes from the codes. Results: Chinese foreign assistance in respect to economic infrastructure development has increased contributions to economic interests and economic growth in short run and long run in Cambodia. Chinese foreign assistance to Cambodia contributes to mutual complementary interests in economic prosperity and on economic growth. Conclusions: Chinese foreign assistance has positive contributions to economic growth, despite 20 percent of participants are concerned over Chinese financial assistance on some low quality of economic infrastructure development.