This article uses the data of Chinese students studying abroad during period of 1985 to 2012,and time series analysis method,to construct the model of ARIMA(2,2,2) to describe the change of abroad Chinese student number.The prediction results are in good agreement with the actual annual numbers of Chinese students studying abroad.Meanwhile,the relationship between abroad Chinese students and annual per capita consumption expenditure in China's urban area is studied,and a regression model is established hence.The co-integration relationship is analyzed and Granger causality test is done.The results show that the logarithmic value of annual per capita consumption expenditure will increase nearly 0.06% due to the increase of logarithmic value of abroad Chinese students by 1%.