According to three years research results, in the treatment (5 and 7) where the plant densities were 92.3 to 96.0 thousand plants ha-1, irrigation scheduling 70-75-60% Fc, the seed-lint yield of cotton were equaled to 3.75 to 3.59 t ha-1, the water productivity were 15.03 to 15.72 m3 t-1, the decrease of water use were equaled to 0.89 to 1.97 m3 in comparison with treatments (6 and 8) where the plant density equaled to 132.7 to 134.0 thousand plants ha-1.