To build a highlevel socialist market economy system,we must adhere to the two “unwavering” principles Because China is developing its market economy under the basic socialist economic system,developing and strengthening stateowned economy helps to leverage the advantages of the socialist system and better leverage the role of the government To play the decisive role of the market in resource allocation,it is necessary to vigorously develop the private economy The key to building a socialist market economy system with coordinated development between stateowned economy and private economy is to optimize the layout of the stateowned economy and allow them to leverage their respective advantages in different fields,promoting each other and developing together The key to substantively promoting the optimization of the layout of the stateowned economy is to establish the standard of “optimization”,so as to establish an implementation plan based on this standard that includes where the stateowned economy should go and where it shouldnt go This article advocates to handle the relationship between the stateowned economy and the private economy based on the principle of classified reform,and achieve the optimization of the layout of the stateowned economy