The Beijing city population control has repeatedly defeated. why？This paper analyzes the effect of population regulation policy in Beijing from the perspective of the internal structure of population growth. From the perspective of the household population，Beijing’s population adjustment policy，not only did not have a more stringent operating space，but to broaden the growth channels，because of the full liberalization of the two child policy and residence permit system. Based on the analysis of the employment and non employment population of floating population，the control effect can be verified from the data，but the total amount is still increasing. Therefore，Beijing’s population control policy change ideas，from “control” to “sparse”，from the ease of low-end industries to the ease of high-end industry.