Two field experiments were conducted during 2003/04 and 2004/05 seasons at the experimental Station, Etay El-Baroud, Et‌Beheira Governorate, Egypt, to study the variability and covariability of ten flax genotypes concerning straw, seed yields and their related characters In addition to quality properties. Mean square values show highly significant differences due to genotypes (G) for all characters under study. Also, due to genotypes x environments (E) interaction except seed index and oil percentage. Whereas, variances due to differences among genotypes (G) were higher than those due to the interaction (G x E). These results indicated that most of variability for these traits was mainly controlled by genetic factors with less influence by environmental factors. This mean that the improvement of these traits could be achieved by direct selection. Heritability (Ho„) in broad sense estimates exhibited highest value for technical length followed by straw yield and plant height. For these also, were observed narrow range between phenotypic (PCV) and genotypic (GCV) coefficients of variability, indicating possibility of using these yield components (technical stem length and plant height) In selection index with giving more weight for technical stem length for improving straw weight per plant. Also, seed weight per plant and No. of capsules per plant exhibited similar results. indicating possibility of using these two components (seed index and No. of capsules per plant ) in selection index for improving seed weight per plant. The strain 15/1/2 was superior than commercial variety Sakhal in both straw yield and long fiber yields per fed. Whereas S. 31/3/2 gave the highest vales, concerning seed yield per fed., seed weight per plant, No. of capsules per plant, seed index and oil yield per fed. Followed by Sakha2 for seed yield per fed., No. of capsules per plant and oil yield per fed. Regarding quality traits, Mane gave the highest long fiber percentage and highest fiber fineness. Also, S. 15/1/2 gave the highest value of long fiber percentage and fiber length. Regarding oil percentage (%), S.31/3/2 gave the highest value, followed by S.2465/1/3 and Sakha2. Therefore, Ariane, 5.15/1/2, 5.31/3/2, S.2465/1/3 and Sakha2 may be incorporated as breeding stocks in flax program aiming to improvement the mentioned baits. Straw weight exhibited significant and positive correlations with each of its three components, plant height, technical stem length and No. of basal branches and also between the two components, plant height and technical stem length. These results indicated that plant height and technical stein length are main components for straw weight per plant. seed yield exhibited highly significant and positive correlations with each of its two components, No. of capsules and seed index indicated that No. of capsules followed by seed index, had the maximum direct effect on