Two field experiments were conducted at the experimental farm of Sakha Agricultural Research Station during 2010/2011 and 2011/2012 seasons. The objectives of this investigation were to study the tolerance of some flax (Linum ustitissimum) varieties to different soil salinity levels and soil properties. Seven flax varieties i.e. Sakha 1 , Sakha 2 , Sakha101 , Sakha 102 ,Eclena ,Elona and Esclena, were grown under three soil salinity levels where: EC values were namely, (S₁ 2: < 4), (S₂ 4: < 6) and (S₃ 6: < 8) dSm^-1.  Split plots design was used, where the flax varieties were allocated in sub plot whereas the main plots were assigned to the salinity levels with four replicates.
The obtained results can be summarized as follow: 
Soluble cations and anions of soil paste extract after harvesting of flax greatly increased with increasing salinity levels. Slight difference between before and after harvesting for soil paste extracts. Total nitrogen, available phosphorus and available potassium increased with increasing soils salinity. Soil salinity significantly affected flax yield and yield components. Flax seed yield (kg /fed.) had the following sequence at the salinity level: Sakha 1 = Sakha 2 > Sakha101 = Sakha 102 = Eclena = Elona > Esclena; at S₁; Sakha 1> Sakha 2 =Sakha101 = Sakha 102 = Eclena = Elona=Esclena at S₂ and Sakha 1 = Sakha 2 > Sakha101 = Eclena = Elona >Esclena=Sakha102at S₃.
The used varieties were arrangedin the descending order according toStraw yield (ton/fed.) as follows:
With S₁: Sakha1 = Sakha2 =Esclena= Eclena = Elona.>Sakha101=sakha102
With S₂: Sakha1 = Esclena=Eclena = Elona > Sakha2 =Sakha101=Sakha102
 WithS₃:=Sakha1= Esclena=Eclena = Elona =Sakha101=Sakha102 > Sakha2
Fiber weight (kg/fed)-technical stem length and radius (cm) significantly decreased with increasing soil salinity levels.
Flax varieties Sakha 1 and Sakha2 were the more tolerant varieties to soil salinity. Whereas   the varieties Eclena and Esclena was the most sensitive one to soil salinity. The varieties Sakha101, Sakha 102   were of moderate tolerant to soil salinity.