In this paper we used Revised Bongaarts Model (RBM) for estimating approximately correct value of total fertility rate (TFR) for data obtained from 1975-2011, nationwide demographic surveys. The contribution of each of the proximate variables has been obtained through the decomposition of TFR for the period 1975-2011 at four points of time. Our analyses clearly indicate that contraceptive practice is playing the key role in fertility change in Bangladesh. The findings of the study provide a basis for drawing out some policy adoption and prescribe some recommendations for further decrease in TFR of Bangladesh.