Hybridized pennisetum foam cushioning material was prepared by using cornstarch as adhesive and isocyanate as foaming agent to develop the market of plant based foam cushioning material and to reduced the environmental pollution of foamed polystyrene. Orthogonal tests were carried out. The results showed that the optimal foaming conditions were as follow: the proportion of Chinese pennisetum: cornstarch: polyvinyl alcohol is 1∶0.3∶0.15; 30 mL isocyanate in per 100 g pennisetum powder; and the microwave foaming time are 7 minutes. The density of foaming cushion material is 0.3 g/cm3 at 14.4% of moisture content and cell number is 19.7/cm2. The stress of the material is 76.3 MPa when the strain is 15% of the whole and the resilience is 80.99%. It was concluded that this material is good for packaging the products with heavy weight or large volume.