In the present investigation, 77 genotypes (54 F1s, 18 lines, 3 testers and 2 check) were evaluated in relation to estimation of genetic components of variance for yield and contributing characters in newly developed single cross maize (Zea mays L.).The analysis of variance indicated that treatments, genotypes and other parameters as well as their interaction with environments had significant for almost all the traits for individual and pooled over environments. The wide range of variation provide vast scope of selection of superior genotype for further maize improvement programme. The estimates of additive variance were higher than dominance variances, ration of additive and dominance variance more than unity and degree of dominance less than unity for days to 50% tasseling, days to 50% silking & cob diameter indicating the preponderance of additive gene action controlling these characters it is better to selection for crop improvement. The estimates of dominance variance were higher than additive variances, ratio of additive and dominance less than unity and degree of dominance more than unity for plant height, no. of leaves/plant, days to 75% dry husk, no. of cob/plant, cob length, cob weight, no. of grains/cob, 100 kernel weight, no. of barren plant and grain yield/plant indicating the preponderance of non-additive gene action controlling these characters, heterosis breeding right choice for improvement of above characters.