ABSTRACT This research was conducted to study the effect of retting water change time, i.e. control as still water and every 24, 48 and 72 hr, beside that the impact of retting water temperature degrees variable, i.e. control as normal temperature degree, 28, 32 and 37 ^oC on some fiber characters for 3 flax local varieties (Giza 10 , Sakha 3 and Sakha 4) and three flax imported ones (Omena , Melano and Sezar), during winter seasons of 2016/2017 and 2017/2018 at EL-Gemmeiza Agric. Res. Station, EL Gharbia Governorate, Middle Delta region, ARC. Egypt. These treatments were arranged in split plot design with three replications.The results showed that, the imported varieties had given better fiber yield/fed. than the local ones, i.e. where Omena and Milano Cv attained the goal during the two successive seasons. On the other hand.Sezar as imported flax variety pronounced its superiority and scored the highest values for fiber percentage and fineness, whereas Melano imported Cv gave the tallest fiber comparing with the others . Tested local varieties, Sakha 3 or Sakha 4 and Giza 10 registered low values for the studied fiber properties under the change of retting water every 24,48 and 72 hours.  As for retting water temperature degree variable, the highest average for fiber % and fineness associated with Sezar CV. also, Melano imported CV. recorded the tallest fiber, as experiencing with the other studied local varieties. With   respect to the optimum temperature , it was 37^oC for retting warm water to produce the best fiber quality traits. Eventually, most of the studied properties were affected significantly by the interaction between the studied treatments i.e. retting water temperature degree and retting water change time/h and genotypes.