This research is describe different contents of diatomaceous earth and recycled polypropylene were melted and mixed. the results showed that when adding 3wt% diatomaceous earth, it has the best bending and impact strength, And when 3wt% diatomaceous earth is added, 10wt% and 15wt% glass fiber are compounded at the same time, and its tensile, bending and impact strength are analyzed. The results in bending and impact strength, with the increase of glass fiber, the strength increases 7%.