Background & Objectives: Agricultural mechanization development in parallel of growing this sector treat farmers' health and safety and other persons in farms. Safety training has a vital role in reducting agricultural machinery operators and farmers' occupational injuries. The purpose of this research was study of agricultural expert's knowledge toward safe work with agricultural machinery .

 Methods: The statistical population of this study was Jihad-Agriculture organization experts in Khuzestan and Ilam provinces (N=493) that 230 of them were selected as the research sample through proportional stratified random method. Data collecting instrument was a questionnaire that its validity was confirmed by a group of extension experts and professors. The Coronbach Alpha coefficient was used in order to determine the questionnaires' reliability. Data were analyzed using SPSS19 software and comparative test .

 Results: experts' safety knowledge was at a suitable level (Mean=3. 73 from 5 and SD=1. 41) and 72.22 percent of them were assessed medium. Also the means comparison test showed that there is a significant difference among respondents' safety knowledge depending upon education level and whether they have experienced an incident in the field or not. But there was no significant relationship between their safety knowledge and participate in safety training course and whether they observe of work incidents or not .

 Conclusion: According to the importance of training in the promotion of farmers' safety and inattention of agricultural and health system managers toward safety on farms, it is necessary for implementation of safety training courses for preparing professionals widely and quality and empowered them to participate in safe agricultural extension program.