The purpose of this study is to determin the effect of acupressure on pain reduction of intramuscular magnesium sulfate injection with Z technique in postpartum cesarean section women .This study will be conducting in Hafez, Zeinabie and Shooshtari hospitals affiliated to Shiraz University of Medical Sciences. 47 eligible post partum cessarian section women affected with sever preeclampsia and eclampsia will enter the study after obtaining a written informed consent. Magnesium sulfate injections are repeated every 4 hours until 24 hours after delivery.In each injection 5cc of drug will be injected in one buttock and the remaining 5cc will be injectde in the other buttock. In this study researcher herself do all the injections. The first injection is without acupressure. The second injection is with acupressure in sham control point which is similar in all patients. The third one is with pressure on UB32 point. Acupressure point is pressed by thumb directly and continuously with pressure equal to 4.5kg/cm2 for one minute followed by three times sequentially. In second injection the same pressure and methode is used in the sham control point.After each injection patients pain will be measured and documented by co-researcher and according to VAS scale.In order to avoid bias neither patients nor co-researcher know which injection is in real point and which is in sham control point. Finally the severity of pain will be compared in three injection.