Abstract: The possibilities of both multiplicities and sustained oscillations are explored by using the bifurcation theory for an isothermal continuous mixed suspension-mixed product removal (CMSMPR) crystallizer in which primary nucleation described by the Volmer model and secondary nucleation described by the magma dependent power law model take place simultaneously.The conditional equations for the existence of multiple steady states and the appearance of sustained oscillations are developed.The multiplicity boundary and sustained oscillation boundary, which are only dependent on the physical and kinetic properties and operational parameters of the process,are obtained by resolving these conditional equations by using the continuation technique.