Talc-filled polypropylene (PP) composites coupled with silane-grafted polypropylene (PP-g-Si) were prepared. Effect of PP-g-Si on the mechanical properties, crystallization. and melting behavior of PP composites was investigated. Compared with the uncoupled composites, the mechanical properties of Talc/PP composites coupled with a small amount of PP-g-Si were increased to some extent. Meanwhile, PP-g-Si can promote crystallization rate and increase crystallization temperature of PP in the composites.