Statement of Problem: Basically, performing dental health services on children is not easy and includes many problems which pain or fear is one of the most complicated ones.Purpose: The aim of this study was to evaluate the effect of music on sensation of pain and fear in children during operative dental treatments in Kerman pediatrics clinic.Materials and method: This experimental and cross sectional study was conducted on 45 children (4-6 years). In the first visit, filling of one tooth (maxillary first molar) was done with routine behavioral management and without music. In the second visit the children were divided into 3 groups and the same process was performed for the similar tooth in the other quadrant, while music (happy, light and no music) was playing in every visit. Children's heart rates were measured three times, as the indicator to evaluate their fear. Finally data were analyzes by statistical program SPSS 11.5 using, T- test and Chi- square test.Results: The average value of pain sensation in the first visit was more than the second time which was significant (p<0.001). Heart rate decreased during dental procedure, but it was irrelevant to the type of music. During the first visit, heart rate displayed upward trend following the initial decrease (p<0. 01).Conclusion: In addition to the use of routine behavioral control methods. Music as a helping method can cause less fear in 4-6 year- old children during dental treatment.Key words: Music, Pain, Fear, Pediatric dentistry