The present experiment was carried out for evaluation the influence of body weight selection at 12 –wk of age for Gimmizah chickens on hatching traits besides same genetic and phenotypic parameters related to it. The obtained results are summarized as follows: fertility percentage was numerically increased for first generation after selection of body weight compared with those for base population also, hatchability percentages were significantly decreased for the first generation compared with those for the base one population, while late and total embryonic mortalities were significantly increased for the first generation comparable to base one. Values of heritability for all studied parameters of fertility, hatchability and embryonic mortalities were low. Also, there are no obvious changes for heritability between base and 1^st generations with respect to all studied hatching traits.  Moreover, most values of additive gene for fertility, hatchability and embryonic mortalities were low with relatively marked decrease for hatchability of total eggs  among the base population and first generation. Highly positive significant phenotypic correlation was detected between fertility and hatchability of fertile eggs. While, all stages of embryonic mortalities represented highly negative significant phenotypic correlations with hatchability of fertile eggs. Moreover, hatchability of fertile eggs is genetically highly positive correlated with fertility. In conclusion fertility, hatchability and embryonic mortality could be considered in designing the program of improving body weight for Gimmizah chickens and this criteria should be involved in the selection index.