The CBR is one of the most important indicators, which decide the population development speed. Taking Chinese CBR as the object of study, this paper mainly constructs a demographic Analysis model of transfer Regression-time Series, which is based on 30 years since the policy of reform and opening. Firstly, the proceeding courses and trends have been simulated dynamically, as well as been forecasted short-term. Secondly, the relationship between foster costs and population growth has been analyzed and taken into conclusions that, as the paper demonstrates, residents' consumable price index has a weak negative influence on the fertility inclination, while the proportion between population that involving economic activities and total population can directly suppresses the rising of CBR.