As shown in Figure 2, STZ-treated caused oxidative stress in rat brain, which increased the MDA content and GSSH content, and reduced the levels of SOD, CAT, GSH, Gpx and TAC, while daphnetin-treated inhibited these changes in oxidative stress-related medicators, which indicated that daphnetin could mitigate oxidative stress of diabetes cognitive dysfunction rats. The gene discussed is CAT; the disease is diabetes mellitus.