Objective:To evaluate the effectiveness for vital pulpotomy in primary teeth with 4 kinds of pulp capping agents.Methods:CHI,CH,GA and FC were chosen as the pulp capping agents for vital pulpotomy in primary teeth and 3 year follow up observation was performed.The teeth in other side served as the controls.The root absorption was observed radiologically.Results:In the group of CHI,CH,GA and FC the clinical effective rate were 100%,87.5%,91.4% and 78.1%,the radiographical success rate were 97%,60%,74.3%and 56.2%,respectively.In the cases treated with CHI showed the highest success rate and significant difference was found among the four groups (P