Cambodia owns around 30 ethnic groups，in which the Khmer Group makes 90% of the total population. The Chinese Group，which has a less number than the Vietnamese one，is the third largest one with around 5% of the population in Cambodian. However，the Chinese Group has occupied quite important position both in Cambodian politics and economics. After the “One Belt，One Road” initiative was proposed by President Xi Jinping，the Cambodian government offered a very positive response，which would bring good developing opportunities to the Chinese in Cambodia. About one thousand years ago，the Chinese and the Khmers founded this country together and experienced the tough times together in the history，which breeded some tight and deep integrating relations. The practice of “One Belt，One Road” needs supports from the local，especially the Chinese. How to guide the Chinese in Cambodia to take part in the practice？This paper will try to analyze the characteristics advice of the Chinese in Cambodia and provide policy a about how to involve the Chinese Cambodiam into “One Belt，One Road” practice by summarizing their historical contributions to the local development.