Focus on the problem that the prestressed stress loss due to friction is great, for the reason that the prestressed concrete structures are super long in length and the force is complicated, in the paper, the hybrid reinforcement by both bonded and unbonded strands, the scheme of sectional stretching of the strands and straight bonded strands are proposed to reduce the loss of prestressed stress due to friction. Calculation result shows that the hybrid reinforcement by both bonded and unbonded strands and the scheme of sectional stretching of the strands can reduce prestressed loss, crack width and deflection. In order to determine the area of non-prestressed steel bar and prestressed steel bar, the crack width control method using improved nominal tensile stress is applied. Taking the ratio of prestressed strength as known condition to ensure total reicforcement ratio not exceed the limit. Compression reinforcements are set in compression zones in the ends of beams to meet the requirement relative of the heights equivalent compression zones for taking the dimendions of beams cross sections as constant.