Abstract: The bifurcation diagrams of state variables versus operation parameters for a continuous isothermal mixed - suspension, mixed - product removal (MSMPR) crystallizer have been obtained by resolving the steady state equations with the continuation technique of nonlinear equations. The number of steady states of the continuous MSMPR crystallization process for various multiplicity regions is determined and the criteria of multiplicity(i. e. , multiple steady states) and uniqueness, which is only dependent of the kinetic properties and operation parameters of the crystallization process, is developed by the use of bifurcation theory. In addition, the stability of steady states is analyzed by using the Routh - Hurwith criteria.