Reinforced concrete beam of flanged section is an optimal option and has special important in reinforced beam design approach for its important in structural fields to maximize concrete beam strength capacity. This paper introduces and investigates flexural behavior of proposed flanged concrete beams of non-prismatic flanges, the proposed cross section is introduced to utilize flange section benefits besides tapering benefits to upgrade structural characteristic of reinforced concrete Tee beams such as section rotation capacity and flexural ductility as well as saving materials and reducing overall dead load without affects ultimate strength capacity. The experimental work program included preparing set of reinforced concrete Tee beams of tapered alignment of non-prismatic flanges, proper steel reinforcement provided according to ACI 318 provisions . Twelve reinforced concrete beams fabricated and tested; which are classified into nine specimens of non-prismatic flanges, one specimen of rectangular section, two specimens of uniform T- section of upper and lower tapered flange thickness of considered nine sections. The structural behavior of developed beams under flexural test is discussed. The main experimented parameters are non– prismatic flange domain, and web thickness. The results confirmed the positive effectiveness of considering in plane non-prismatic flanges within T-section upon strength rating, flexural ductility, without significant effect upon ultimate load capacity and flexural stiffness. Also, the results confirmed that up 47% of member weight could be saved when shape optimized concrete beams volume regards non prismatic flanges.