Abstract: In order to further study the influence factors of compressive strength and flexural strength of steel-polypropylene fiber reinforced artificial granite (steel polypropylene fiber/artificial granite) composite, the void ratio of aggregate accumulation was studied by drainage method. The aggregate gradation and experimental index q were determined, and the compressive strength and flexural strength of a large number of specimens were tested. The influences of the mass fraction of each component and the void ratio of aggregate on the compressive strength and flexural strength of the steel polypropylene fiber/artificial granite composite were analyzed. The experimental results show that steel fibers and polypropylene fibers can significantly increase the flexural strength of steel polypropylene fiber/artificial granite composite. With the increase of the content of steel-polypropylene fibers, the compressive strength and flexural strength of the steel polypropylene fiber/artificial granite composite specimens increase gradually. When the mass ratio of steel fibers to polypropylene fibers is 30∶1 and the content of steel-polypropylene fiber is 1.7wt%, the compressive strength of the steel polypropylene fiber/artificial granite composite specimens increases gradually. The flexural strength of the steel polypropylene fiber/artificial granite specimens reaches the maximum when the steel-polypropylene fiber content is 1.9wt%. The closer the mass fraction of binder to the void ratio of the aggregate, the greater the compressive strength and flexural strength of the steel polypropylene fiber/artificial granite composite are. When the aggregate is 80wt% and the binder is 11wt%, the compressive strength and flexural strength of the steel polypropylene fiber/artificial granite specimen reach the maximum at the same time.