The paper analyzes total fertility rates of Chinese Mainland，Hong Kong，Macao，Taiwan and Singapore and finds that fertility rates of major regions of East Asia for Chinese have been below the rate of population replacement，which are influenced by economic factor，social factor and cultural factor. The transformation from controlling population growth to stimulating population growth will come in the form of policy adjustment direction and focus during a period of time in these countries and regions. It suggests that formulation and adjustments of population policies should judge the hour and size up the situation，or else the existing problems will not have been resolved，and new problems will be created.