The article analyzes the fiber yield and fiber quality, which have a negative correlation coefficient, using different methods of selection in the selection of mid-fiber cotton varieties, and analyzes the separation of fiber and high fiber content. It is suggested that positive hygiene can be found in pairs of hybrids and families in order to detect positive transgression, and by selecting larger samples, positive plant recombinant plants can be found. Practice is made of O-445 family, created by double hybridization on fiber yield, Range T-33-35/18, family O-580, created by double hybrid to improve fiber length, T-25-27/18 and T-54-56/18. the use of selection processes. KEYWORDS: cotton, double hybrids, complex hybrids, family, ridge, variety, population, fiber yield, fiber length.