Dihuang Yinzi can significantly decrease the contents of interleukin-6 (IL-6), tumor necrosis factor-α (TNF-α), and interleukin-17 (IL-17) in brain, serum, and colon tissues and increase the contents of transforming growth factor-β (TGF-β) and interleukin-10 (IL-10) in cerebral ischemia-reperfusion model rats. This evidence concerns the gene IL17A and Cerebral ischemia.