A natural composition that includes C. osmophloeum and C. pinnatifida. The C. osmophloeum is an aqueous extract of Cinnamomum osmophloeum leaves. The Crataegus pinnatifida is an aqueous extract of C. pinnatifida fruit. The weight ratio of the C. osmophloeum to the C. pinnatifida is 1:0.05-2, the preferred ratio is 1:0.5-1.5, and the optimal ratio is 1:0.9-1.1. The pharmaceutical composition has an α-glucosidase inhibition effect. The natural composition can further inhibit α-amylase to regulate the absorption of blood glucose and carbohydrate.
