This paper summarized Professor Xiao Chengcong's characteristics of treating postpartum body pain from kidney and thoroughfare vessel by paying attention to the essence and blood in kidney.She believes that deficiency of qi and blood and stasis obstructing meridians and collaterals are the pathogenesis of postpartum body pain，and emphasizes the pathogenesis basis is kidney deficiency and yin-blood deficiency of thoroughfare vessel.This paper introduced the clinical experience of flexible application of Duhuo Jisheng Decoction based on the principle of tonifying the kidney and nourishing blood accompanied by activating blood and dredging collaterals.