There is much research on the relationship of economic growing and carbon emission, but most of them were based on the western countries' data. Few researchers pay attention to the undeveloped areas in western of China. As Gansu is a typical province, who's economic development lagged behind while the quality of carbon emissions are large. In this paper, data of 2003-2013 is collected and least-squares regression is used to analyzed the factors affect the carbon emission in Gansu, the conclusions are that the industrial structural,proportion of heavy industry,and GDP are the three main factors affect carbon emission, and at the end, suggestions on how to keep growing while reducing carbon emission are improved.