The assumption of “uniform flow of internal migration” used in Rahman (1987) is generalised in this paper for cases when the flow of internal migration is increasing or even decreasing. In particular, the cases when the migration rate is proportional to the national population or to the regional population are analysed. Procedure for estimation of the migration rate and the pure migration are given. The formula for prediction of population is also provided. As an application of the procedure, migration to the Dhaka SMA is analysed with the help of Census Data.