Perfectionism and mood states are psychological constructs which according to the results of recent studies, have substantial role in sport performance. The purpose of this research was to determine and compare therelationship between sport perfectionism and mood states inteam and idiviual sports athletes. The Research method used is descriptive with a correlative approach. Based on random sampling, 70 athletes in individual fields and 70 in team fields have selected from national super league. for data collection, two questionnaires of sport perfectionism, Dunn,et al (2006) and Brums, Terry et.al (2003) were used and for data analysis took Pearson correlation coefficient, independent t-test and Z Fischer. The results indicated that in team and individual fields, there was a positively significant relationship between concern over mistakes as a negative aspect of perfectionism and scores obtained on negative mood before competition, while such relationship was negative for vigor. There was no significant relationship between perfectionism of athletes of team and individual but depression and fatigueof team athletes significantly was better than individual athletes. Finally the results of Z Fischer test showed no significant difference between perfectionism correlation coefficients and mood states before competition in team and individual athletes. Negative performance via negative reaction mechanism regarding to error and mistake causes negative mood while positive perfectionism due to motivational effects results in improving positive mood.