Abstract: Diabetic vascular complications are specific damages caused by diabetes mellitus belonging to Vessel and Collateral Damage of Xiaoke Disease. Large vessel diseases and small vessel diseases related to diabetic complications can be categorized to Luobing. As collateral damage is considered as the pathogenesis of diabetic vascular complications according to Luobing theory， expelling blood stasis and dredging collateral should be applied to inhibit the early middle and late stages of diabetes mellitus. According to the extent of collateral obstruction， there are three stages: collateral qi stagnation， collateral blood stasis and collateral blockage and expelling blood stasis and dredging collateral medicines with different effects should be applied in different stages in order to improve clinic effects.