The purpose of this investigation was to examination the genetic potential of a set of five genotypes and their 10 F₁ hybrids combinations through estimation their genetic parameters controlling inheritance of important economical characters in cucumber. A half diallel mating design was applied using five lines of cucumber. The parental lines demonstrated wide range of diversity regarding studied traits which appeared from the significant differences that found for the studied traits. Analysis for combining ability indicated that GCA and SCA variances were largely significant, indicating that both additive and dominance gene action included in the manifestation of all studied traits. The results reported that the good general combiner parent that showed to have the significant positive magnitudes of GCA effects was reported to be parental line "99-340"(P₃) and parental line "99 -357" (P₄) for ennobled studied traits. Furthermore, the highest SCA magnitudes were obtained by the following combinations; P₂ x P₃; P₂ x P₄ and P₃ x P₄ for early yield / fed., average fruit weight (g), number of fruits / plant and total yield / fed (ton) traits, which are the best and promising F₁ hybrids. The large heritability indicates few effect of the environment of the studied traits. Broad sense heritability percentage ranged from 88.24 to 99.84 % for fruit diameter and average fruit weight, while narrow sense heritability percentage ranged from 8.73 to 92.56 % for number of fruits / plant and plant length. According to current results, it's could recommended that the integration of these parental lines in genetic enhancement cucumber programs directing to increase yield and improve other interested traits.