The leaf shape, size, area and number of leaf per plant of cotton are factors which effect seed yield via photosynthetic activity. In the study, the four cotton cultivars, two normal leaf shape and two okra leaf shape, were used as material. The number of leaf, mean of individual leaf area, leaf area index, leaf chlorophyll content, plant height, number of monopodial and sympodial branches and cotton seed yield were investigated. The coefficient correlation between cotton seed yield and all characters was analyzed. The normal leaf shape cultivars were the higher than okra leaf shape cultivars for mean of individual leaf area, leaf area index, plant height, number of sympodial branches. The highest chlorophyll content (50.54) was for Maras 92, but Dicle 2000 had the minimum content with 46.44. Maras 92 variety, okra leaf shape cotton cultivar, for cotton seed yield was the highest with 509.93 kg da(-1), Siokra (1)/(4) had the minimum cotton seed yield (365.56). Seed yield was pozitive correlation with leaf area index, but was negative correlation with number of leaf per plant.