Abstract: In order to obtain wollastonite filled β-polypropylene (W/β-PP) composites with high toughness, calcium pimelate-supported wollasonite (β-W) was used to fill polypropylene (PP). The β-nucleating effect of β-W in W/β-PP composites was investigated, and mechanical properties of wollastonite and β-W filled PP composites were compared. The results show that wollastonite filled polypropylene (W/PP) composites mainly form α-crystal, while β-W has strong β-nucleating effect for PP crystallization. The notched impact strength of W/PP composites is lower than that of β-polypropylene (β-PP), and the synergistic effect of toughening between wollastonite and β-crystal results in higher notched impact strength of W/β-PP composites compare with β-PP. The notched impact strength of W/β-PP composites increase firstly and then decrease with the increase of the β-W content and reaches to the maximum at the mass fraction of 5%. In addition, the reinforcement of wollastonite enhances the stiffness of β-PP.