In article is performed analysis of product structure of agricultural firm with using of method of carbon balance. Whereby this method is calculated variant of product structure for contemporary production of cereals on the level 5280 ton of com. Due high quantity of growing oil plants and legumes was needed to rise intensity of growing of perennial fodder on arable land and permanent grassland (rising of yield about 36-62 percentage). It is necessary for attainment of balance of structure. This higher production of green fodder allows increase of number of cattle about 34 %, output of reserve of fodder and their possible sale. In view of running of firms is also important election of suitable product Structure in according to its economic efficiency. For its delimitation was used calculation of gross margin. The gross margin is in crop production negative. It can it's compensate for products of animal production (in given firm for milk). Calculation of gross margin does not consider fixed costs.