The polypropylene/Stannic oxide(PP/SnO2)composites were prepared by means of blending.The effects of the using amount of SnO2 and the varieties of surface treating agent on the mechanical properties and structure of the composites were investigated.The results showed that dispersibility of SnO2 treated with Titanate 311w was improved;the impact strength and tensile strength of the composites were improved when the content of untreated SnO2 is 3~6phr,but the impact strength of composites was increased to 24....