Abstract: A review of studies on the mechanical properties ofmicrocellular plastics is given in this paper. The fabrication and characterization of microcellular plastics are introduced brietly and the emphasis is placed on the studies on into mechanical properties of microcellular plastics, including some author's work in this field. They are mainly concerned with the compressive behavior, tensile behavior, impact behavior, fatigue and visco-elasticity of these materials. Finally, some discussions and future development trends are also presented.