Abstract: Hybrid composite tensioned element on the base of steel and carbon fiber reinforced plastic (CFRP) with strengthened sections was considered as an object of investigation. Strengthening of the most heavy loaded cable's sections is necessary to decrease the difference between maximum and minimum axial forces in the cable, which depends on the deflection. Strengthening of the cable's sections was carried out by the increase of volumetric fraction of steel in some sections by the length. The behaviours of tensioned hybrid composite element with strengthened sections were investigated analytically and by experiment. The hybrid composite tensioned element with strengthened sections was considered as a material of cable net of prestressed saddle-shaped cable roof 50x50 m in plan, together with the steel cables. It was stated, that the using of the tensioned hybrid composite element with strengthened sections enables to decrease consumption of cable net materials.