In article the generalizing overview of approaches to production of the roll-formed sections of variable section used in the world is carried out. The relevance of use of modeling of tensely deformed condition of a profile by a finite element method for the purpose of forecasting of appearance of defects by its production is considered. It is pointed out demand of profiles with variable section. The scheme of molding is described, and the possibility of reasonable reduction of number of technological transitions is specified. Modeling of shaping of trough roll-formed section with variable cross-section with the lower horizontal wall is executed, the algorithm of a task of boundary coditions is shown. Change of the intense deformed condition of preparation at its passing through a cage of a camp is considered.