Two field experiments were carried out at the Experimental Farm Governorate of Sakha Agricultural Research Station,  Kafr-elSheikh, Egypt during the two successive seasons 2006/2007 and 2007/2008. The main objectives of this investigation were to study the effect of irrigation regime in four different growth stages (skip-irrigation at stem elongation 41 days after sowing (DAS), apical branching (64 DAS),  flowering (83 DAS) and  seed filling (114 DAS)). on growth, yield and yield components of  six flax genotypes ( Ilona , Sakha 3,  Sakha1,  Sakha2,  strain16  and  Giza 8).  The obtained results could be summarized as follows. Skip-irrigation at seed filling gave the  highest values of technical stem length in the first season , stem diameter and straw yield/fad. in both seasons. Also, flax genotypes under study differed significantly in their straw yield and its related characters in both seasons, except straw yield in the first season and stem diameter in the second season. Giza 8 gave the highest value in  stem diameter and yield of straw yield / plant in both seasons, while Sakha 2 gave the highest straw yield /Fad. in both seasons. The interaction between irrigation treatment and flax genotypes had a highly significant in technical stem length and straw yield per plant  in the first season. Skip-irrigation during the  seed filling gave the  highest values in length of top capsule zone, number of capsules/plant, number of seeds/ plant and seed yield/Fad. in both seasons. Skip-irrigation at flowering stage gave the highest oil seed percentage  in both seasons. Also, flax genotypes under study differed significantly in their seed yield and its related characters in both seasons. In this respect Strain16  recorded the highest  length of top capsule zone, number of capsules per plant, seed yield per plant in first season while Giza 8 recorded highest value in second season. Strain 16 recorded the highest value in seed oil content in both seasons. The interaction between irrigation treatment  and flax genotypes was significantly for length of top capsule zone,  number of capsules /plant, number of seeds/plant  and seed oil content  in both seasons. On light of the obtained results, skip one irrigation during the seed filling stage gave better results under lower amounts of water during the growth of flax.