Objetive:To investigate the nerve protective effect and mechanism of baicalin on newborn rats with hypoxic ischemic brain damage(HIBD).Methods:A total of 64 SD newborn rats were randomlu divided into control group.model group.nerve growth factor group and baicalin group.with 16 in each group.Left carotid artery ligation method was adopted to establish the HIBD model except fou in control group,which was treatde with intraperitoneal injection of salin e10mL/kg for 3 d.After oxygen recovery on hypoxia ischemia rats.intraperitoneal injectionof salin 10mL/kg was adopted in model group for 3 d.Intraperitoneal injection of nerve growth factor injection50μg/kg per day was adopted in nerve growth factor group for 3 d:intraperitoneal injection of radix scutellariae 16mg/kg per day was adopted in baicalin group for 3 d after modeeling.Four rats of each group were sacrificed at Day 1,2,3,7 for microscopic observation of pathological morphological changes in brain tissus aften HE staining,S-P immunohistochemical method was used for observation of Fas and FasL expression in brain cells.Results:Neat structure of cells was observed in control group;edema cells in disordered arrangement was observed in model group,with some cells necrosis and cavity change;tissue injury in nerve growth factor group and baicalin group was significantly lighter than that in model group;Fas and FasL expression in model group,nerve growth factor group and baicalin group were significantiy higher than that in control group at different time points(P<0.05):Fas and FasL expression in nerve growth factor group and baicalin group were significantly lower than that in model group at different time points(P<0.05):There was no statistical diggerence of Fas,FasL expression at each time point between nerve growth factor group and baicalin group(P>0.05).Conclusions:Baicalin can reduce expression of Fas and FasL in HIBD rats,inhibit apoptosis of nerve cells,thus achieve the protective effect on HIBD rat nerves. Objetive: To investigate the nerve protective effect and mechanism of baicalin on newborn rats with hypoxic ischemic brain damage (HIBD). Methods: A total of 64 SD newborn rats were randomized into control group. Model group. Nerve growth factor group and baicalin group .with 16 in each group. Left carotid artery ligation method was adopted to establish the HIBD model except fou in control group, which was treatde with intraperitoneal injection of salin e 10 mL / kg for 3 d. After oxygen recovery on hypoxia rat rats. intraperitoneal injectionof salin 10 mL / kg was adopted in model group for 3 d. Intraperitoneal injection of nerve growth factor injection 50 μg / kg per day was adopted in nerve growth factor group for 3 d: intraperitoneal injection of radix scutellariae 16 mg / kg per day was adopted in baicalin group for 3 days after modeled. Rats in each group were sacrificed at Day 1, 2, 3, 7 for microscopic observation of pathological morphological changes in brain tissus aften HE staining, SP imm unohistochemical method was used for observation of Fas and FasL expression in brain cells. Results: Neat structure of cells was observed in control group; edema cells in disordered arrangement was observed in model group, with some cells necrosis and cavity change; tissue injury in nerve growth factor group and baicalin group was significantly lighter than that in model group; Fas and FasL expression in model group, nerve growth factor group and baicalin group were significantly higher than that in control group at different time points (P <0.05): Fas and FasL expression in model group, FasL expression in nerve growth factor group and baicalin group were significantly lower than that in model group at different time points (P <0.05): There was no statistical diggerence of Fas, FasL expression at each time point between nerve growth factor group and baicalin group (P> 0.05) .Conclusions: Baicalin can reduce expression of Fas and FasL in HIBD rats, inhibit apoptosis of nerve cells, thus achieve the protective effect on HIBD rat nerves.