Abstract: The breeding lines and standard varieties were evaluated for seed cotton yield in seven different environments. The mean squares of genotype x environment (linear) in stability variance analysis was found to be significant. The genotypes were tested by stability parameters such as regression coefficient (bi), deviations from regression (S2d), equivalence value (W2i), stability variance parameter (σ2i), variance of yield value (S2i) and coefficient variation (CVi). The results of different stability parameters were found to be similar to each other for selected genotypes. Kurak 2 and NAK 91-1, breeding lines for drought tolerant and Multi- Adversity Resistance, respectively, were the group of the best adaptation to all environments.