A continuous model for a multistage absorption column is developed by considering the stage number as a continuous variable. Mathematical formulation of the unsteady state material balance gives rise to a single partial differential equation instead of a large system of difference-differential equations. Analytic solution is determined in a series form which converges very fast and thus the continuous model has merits in comparison to the discrete model especially when the number of stages becomes large. By using a numerical example for a six-stage absorber the two models are compared in terms of the steady state profiles and the dynamic response curves. The agreements turn out to be remarkable and thereby the continuous model proves itself to be valid and useful in describing the dynamic behavior of multistage absorption column. Application of the continuous model is further extended to study the various cases of dynamic behavior.