It is a core-shell product, with the inorganic powder as the core, and the nano ZnO as the shell which is precipitated onto the surface of the core by in situ reaction method. Its surface also goes through the activation treatment. With the agglomerate structure, the traditional ZnO is involved in the reaction with the rubber mostly using its ZnO on the surface of the agglomerate, while the inner ZnO is less involved, which causes the excessive use and waste of ZnO as well as pollutions to the environment. This product has a ZnO content of 40-60%, and a high surface area of 10-50 m2/g. The low ZnO content is less harmful to the environment, which is advocated worldwide.