The response surface method was used to evaluate the concentration range, property and degree of Scutellaria(HQ) and Coptis(HL) herb pair on improvement of glucose and lipid metabolism in this paper. Type 2 diabetes mellitus(T2 DM) was induced in rats by low a dose of streptozotocin(STZ) in combination with high-fat diet feeding. The rats were administered with HQ-HL extract pairs at different ratio(1∶0, 3∶1, 2∶1, 3∶2, 1∶1, 2∶3, 1∶2, 1∶3, 0∶1). To investigate the influence of herb pair extracts on glucose a...