The definition of growth factors is the core subject of the economic growth study. From the situation and trend of world economic growth, we could see that human capital is playing a key role by taking the place of material capital and labor. This paper empirically analyzed the contribution of human capital to Hunan economic growth by utilizing modified Cobb-Douglas production function, and compared it with two other places. The results showed that human capital made positive contribution to Hunan economic growth, but its function mechanism was not so significant as Beijing and Guangdong. Some...