Objective To explore the effects of NO and tumor necrosis factor α(TNF α) on the develo pment of pre gnant hypertension syndrome(PHS) and fetal intrauterine growth retardation(FIGR) and the machenism of Qi boosting Blood quickening method(QBBQM) to increase p lace ntal blood supply. Methods Rat model was prepared by L Arginin e methyl ester(L NAME) subcutaneously injected to the pregnant animals on the 10th day of pregnacy.Then,Astragalus and Salvia Injection(ASI) and nitroglycer ine were used to cause intervening effect to the modeling anima...