Abstract: In the 18th century,the domain of China was filially fixed,it was the result of historical evaluation for more than two thousand years.The government of the Qing dynasty adopted a series of effective measures for the frontier administration and exploitation.These measures not only promoted the development of social polities,economy and culture in these areas,but also helped their exchange with the interior，thus consolidating the rule of the Qing court。After the Independence of the United States in the later period of 18th century，America progressively occupied most parts of the west.This process caused American Indians untold sufferings.The immigrants exploited the land in pure capitalistic way,and created a new model of territorial expansion and economic development。For the different background of society、cultural tradition、geography conditions and administrative style,it’s interesting to make comparative studies on the frontier situation of the two countries.