After 30 years of high speed development, China has entered into a key period of adjusting economic structure and changing the mode of development. This article analyses current problems in structures of GDP, distribution, industry, and energy, and the direction of adjustment. Based on the above analysis, it addresses the content and necessity of changing the mode of development, and five “adherences” in the changing. It points out that unhealthy economic growth is harmful to the future. The strategic opportunity period is in the first place for changing the mode of development. To change the mode of development must change the view on government work and improve its evaluating system. Lastly, it proposes several directions for changing the mode of development in engineering sector