Western economic growth theory goes through such analysis as follows: the decisive factor of economic growth changes from exogenous variable to endogeous variable

the term of economic growth changes from short to long. The analysis makes economic growth have same meanings with economic development in some aspects. The former and the latter go into harmony on theory. This theory makes a notable impact to economic growth on theory and practice in developing countries. It’s reflex to the harmonious situation of economic growth and development theory provides good inspiration for economic development in developing countries. Firstly

must promote economic development by rational disposition of the modern market economy system. Secondly

promote economic growth by the comprehensive action of essential factor input and technological innovation. Thirdly

promote whole economic development by the integration of growth and development. Ecological protection is a prerequisite to real economic development. So economic development certainly is sustainable. Economic development has both strong bases and many obstacles in developing countries in 21st century.