Six watermelon crosses and five parental genotypes were evaluated, ¡n the Experimental Farm of El-Kassasien Horticulture Research Station during the seasons of 2001-2003, to study the genetic behavior for morphological, yield and its quality and to study the nature of general and specific combining ability for parental genotypes and their hybrids, as well as, determine the correlation coefficient among the above mentioned coefficient. The results revealed that highly significant difference was found among the genotypes for all studied morphological, yield and fruit coefficient. Variances due to parents vs. hybrids were significant for all studied coefficient, indicating the expression of substantial amount of heterotic effects. The estimates of variances due to specific combining ability were positive and considerably higher in magnitude than the variance of general combining ablity for all coefficient except days to flowering, number of fruits/plant and fruit length. The parents that proved to be good general combiners on the basis of their desirable (gca) affects for total yield/plant and fruit characteristics were the introduced lines and Peacock Improved for yield and Charleston Gray and Jubblee for fruit coefficient. The best specific cross con nations, which exhibited significant desirable (sca) effects for total yield/plant, were 3iza 1 X Peacock 1m proved and Giza 21 x Charleston Gray. Heritability estimates in broad sense were found to be considerable high values for fruit yield/plant as well as number of fruits/plant and fruit weight. The association analysis revealed that fruit yield/plant was positively correlated with plant height, fruit number/plant, fruit weight and total soluble solids. Negative correlation coefficients were observed between days to flowering and number of fruits and fruits yield/plant.