Two field experiments were carried out in Bahada, El-Kanater El-kheiria, Kalubia Gonvernorate during the winter 2011/2012 and 2012/2013 seasons to study genetic analysis of energy production of Gemiza-7, Gemiza-9, Gemiza-10, Gemiza-11, Sakha93, Sakha94, Giza 171, Giza-168 and Misr-2 cultivars. Results can be summarized as follows: 1-There were significant differences between the nine wheat cultivars under this study in growth characters and yield and its components (except in crop index and

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... est index). 2-Plant height, number of tillers, leaves and spikes/plant, tillers+sheats and blades dry weight/plant, 4 th leaf area, blares area/plant and LAI for all cultivars tended to increase with advance days of plant age up to 100 days after sowing and thereafter decreased, meanwhile, spikes dry weight/ plant, main spike dry weight, and flag leaf blade area tended to increase with advance plant age up to 120 days after sowing. 3-The nine wheat cultivars differed in photosynthate partitioning, where, significant differences were found in chemical components of vegetables organs, grains and straw, also, in glucose required for synthesis of the chemical components in the pravious wheat cultivars (except of oil in grains and carbohydrate and protein in straw where the cultivars differences failed to reach the significant level at 5%), as well as, carbon equivalent for each one from carbohydrate and protein in vegetative organs and grains, also, oil in grains. It is worthy to mention that the cultivar differences in carbohydrate and protein of straw was significant. 4-There were significant differences between cultivars under study in yield energy per plant and/or per feddan, where, Misr-2, Gemiza-9, Gemiza-11, Sakha94, Giza 171 and Sakha93 significantly outweighted the other three cultivars Gemiza-7, Gemiza-10 and Giza-168 in this parameter. 5-Highly significant and positive correlation estimates were detected between grain yield/plant and each one of No. of tillers/plant, weight of spikes/plant, grain index, blades area/plants, and flag leaf blade area, between grain index and No. of tillers/plant as well as wt. of spikes/plant and between flag leaf blade area and each of No. of tillers/plant, wt. of spikes/plant and grain index ,also, between plant height and spike length. 6-Flag leaf area, grain index. No. of tillers plant, wt. of spikes/plant and blades area/plant could contribute much of wheat grain yield since R 2 was 92.138% of the total variation and the total correlation between these parameters was most pronounced in the No. of tillers/plant (r = 0.78), wt. of spikes/plant (r = 0.82), grain index (r =0.85), blades area (r = 0.66) and flag leaf blade area (r = 0.99), respectively.