Abstract: The present paper deals with the biological characters of photoaesth esia, oxygenphile, suction force, growth and development of seeds of the wild flax. In this study the biological bases for its cultivation in the plateau and acclimatization to the high- cold and arid region are discussed. Its resistance to cold, aridity, covering with sand and barren land, is the ecological its adaptability to the growing environmental conditions. These biological characters are the ecological base for higher productivity under cultivated conditions. On the height of plant, number of branches, length and diameter for textile crafts, productivity and quality of its seeds and fibers, the cultivited perennial flax is better than the wild plant growing in nature conditions. The result of this study shows that the flax (Linum perenne L. var. Sibiricum Planch) will be of some value for cultivation and prospects for useing its oil as well as fibers.