The purpose of this study was to evaluate the success of Formocresol pulpotomy compared with Ferric sulfate and Electro coagulation and Laser pulpotomy in primary teeth. Fourty seven primary second molars of children aged 5-8 years, were divided randomly into four groups: 10 Formocresol , 13 Ferric sulfate , 13 Electro coagulation, 10 Laser. All teeth were filled with ZOE and sealed with Compomer, and S.S.Crown as final restoration. The success rate was 90 % - 84.6 % - 84.6 % - 83.3 % respectively. These differences were not statistically significant p=0.05), but there were a relation between the pretreatment physiologic resorption of roots and the type of hemorrhage during the amputation procedure. This study revealed that Ferric sulfate, and Electro coagulation, and Laser pulpotomy are good alternative to Formocresol pulpotomy.