In traditional growth theory, the sources of economic growth is focus on physical factors, countries with the same technology and population growth rate eventually converge to the same steady-state growth rate, and the steady-state growth rate is exogenous. But it can not explain the differences in growth rates persist among countries of long periods. Therefore endogenous growth theory combines physical and intangible components to explain the economic growth phenomenon, and it attempts to make the growth rate endogenous.This paper is to survey endogenous growth theory. We analyze the main growth model, such as government budget, increasing returns to scale, human capital, and research & development. In conclusion, endogenous growth theory view that government policy and economic behavior more generally are able to effect the growth rate in the long run, hence it implies more variety of policy implication for the governments to pursue economic growth.