The present study was conducted in purposively selected Bharatpur district of Rajasthan as National Research Centre on Rapeseed Mustard (NRCRM), Sewar is located in Bharatpur district. Three panchayat samities were selected from identified district, because Front Line Demonstration on mustard were conducted in these three panchayat samities only by the NRCRM. All 12 villages where FLDs conducted were included in the present study. Fifty-one beneficiary respondents were selected on whose farm FLDs were conducted by NRCRM. Like wise, a sample of 51 non-beneficiary respondents on whose farm FLDs not conducted were also selected. Thus, total study sample comprised of 102 respondents. The results of the study indicated that majority of the beneficiaries and non-beneficiaries possessed medium level of knowledge about mustard production technology. The extent of knowledge about all the improved package of practices ranged from 28.60 to 99.33 per cent among beneficiary respondents, whereas in case of non-beneficiary farmers it was ranged from 18.80 to 91.67 per cent in the study area. The average knowledge score of beneficiary respondents was found to be substantially higher than the non-beneficiary respondents and overall knowledge difference between beneficiary and non-beneficiary farmers was found more than 15 per cent. It was further observed that a significant knowledge difference was existedwith regards to all the practices of mustard production technology between beneficiary and non-beneficiary respondents. It means there was positive impact of FLDs conducted by NRCRM on gain in knowledge about mustard production technology among beneficiary farmers in the study area. Key words :

Keyword: Front Line Demonstration, Beneficiaries Non-beneficiary