Wollastonite was inorganic modificated by coating aluminium silicate with heterogeneous deposition method.SEM, XRD, FTIR, BET surface area analyzer were used to characterize the product. XRD result shows that wollastonite is coated with nano-aluminium silicate. BET result shows that the specific surface area of particles increases by 200%. FTIR result shows that the content of OH group increases.Whiteness test shows that the whiteness increases by 2.0. Application test shows that the polypropelyne(PP) products filled with inorganic modificated powder have superior physical properties or mechanical properties(tensile strength 20.45Mpa, bending strength 38.02Mpa) than that with uncoated wollastonite and pure PP and the heat distortion tempeature increases by 28.6°C than pure PP.Inorganic modification of wollastonite can improve the joint interface between wollastonite and PP.