The biomass cushioning packaging materials was prepared using sunflower stalk pith residue as raw materials. The systemic researches of the material performances were conducted by comparing the foamed polystyrene (EPS) materials according to A method of GB/T8618-1987 static compression test of the comparative study of cushioning performance. Using the material density, the adhesive selection and the foam agent modification as main factors, and the cushioning properties as index, the molding process was optimized. Meanwhile the mechanical properties were also investigated. The results showed that the material, with minimum cushioning coefficient of 3.6 and maximum modulus of rupture (MOR) of 12.56 Mpa, exhibited excellent performance of protecting, which could substitute the petrochemical products as a new type biomass cushioning packaging materials.