Drought is a wide spread problem seriously influencing rapeseed (Brassica napus L.) production, mostly in dryland regions. To investigate the effects of water deficit on some canola (Brassica napus L.) genotypes. Four drought treatments i.e. 4800m3/ha, 3840m3/ha, 2880 m3/ha and 1920 m3/ha on yield and yield components of six canola genotypes i.e. Serw 4, Serw 10, Pactol, Line 51. Two field experiments were conducted during 2014/2015 and 2015/2016seasons. Results revealed that irrigation using 3840 m3/ha at four times came in the second rank for all studied parameters It increased above aforementioned traits using 1920 m3/ha as two times by 9.4, 26.2, 40.5, 45.6, 46.0,54.4, 20.5, 25.8 and 58.3%, respectively comparing by irrigation using 1920 m3/ha in two times as average of both seasons. Whereas, sown Serw 4 cultivar surpassed Serw 10 cultivar in plant height, No. of branches/plant, No. of silica/plant, seed weight/plant, seed, oil and protein yield/ha by 3.0, 21.8, 30, 21.6, 33.9, 26.7 and 37.9%, respectively as average in both seasons. It could be recommended that irrigation five times by 4800 m3/ha of Serw 4 cultivar significantly maximized seed, oil protein yield/ha.