The sustainable development of Xi’an was analyzed based on statistical data from 1996—2008 using economic theory to find the principle factors influencing the development of Xi’an and to identify the formula of contribution rate to the growth of Xi’an by each factors. The regression analysis is used to obtain the value of contribute rate. The result show that the largest contribution is from accumulation of physical capital, and the contribution from technological advances is increasing year by year. The labor factor and human capital investment make little contribution to Xi’an growth. Capital allocation and scale economic do negative effect to economic growth.