中文摘要：

来华旅游人数受多种因素的影响，其中客源国因素的影响是一个重要方面,对来华旅游的15个主要客源国的11个影响因素，运用主成分分析方法提取出4个影响来华旅游的主要因素，计算出各个客源国的综合得分,得出影响国外来华旅游的首要因素为客源国的经济文化发展水平，其次是人口航运、旅游环境、消费意愿等因素的影响,通过对15个主要客源国进行聚类分析，可以看到文化和地域差异，也是影响来华旅游人数的重要因素。

英文摘要：

The number of inbound tourists is influenced by various factors in which the tourists′ country is an essential one. By using principal component analysis, four factors of the eleven which influence the number of tourists of fifteen major tourists′ countries is reduced and the synthetical score is got through calculting. The conclusion shows that the first factor which influences the number of inbound tourists is tourists countries′ economical and cultural level and other factors are their population and air-transport, traveling surroundings and expending willing. And the cultural and territorial difference is also a factor to influence the number of inbound tourists through cluster analysis to the fifteen tourists′ countries.