The present study examines the constraints to the application of integrated crop management in sustainable agriculture from the view of experts in Rey county. It is an applied and descriptive-correlative study. The statistical population consists of 30 experts from Jihad for Agricultural Bureau in Rey county during 2011. The research tool is a questionnaire and its validity is assessed by academic experts and its reliability examined by Cronbach's Alpha coefficient. The examination of correlation coefficients indicates that training, financial, institutional-organizational, and cognitive limitations have significant and positive relationships with the application of integrated crop management while it has a negative relationship with age of respondents. In addition, the results of multiple regression show that the aforementioned variables can explain 60% of changes in the application of integrated crop management.