The glass fiber reinforced plastics (GFRP) have been widely used in retaining pile of end soil of shield metro; but the study of the bearing capacity of circular crosssection of GFRP reinforced concrete components is insufficient. As a result, the calculation formula of the crosssection bearing capacity of the rounded GFRP reinforced concrete flexural components based on concrete compressive failure is deduced. And then it is compared with the calculation formula of the existing industry standard, [WTBX]Technical Specification for Shieldcuttable Concrete Reinforcement[WT], in terms of the reinforced bar and safety reservation. The results show that, compared to the existing industry standard, the calculation formula deduced is superior to that from the existing industry standard in terms of reinforced bar design and construction cost under the conditions of diameter of component less than 1 m and design bearing capacity less than 1 000 kN·m; and after further study, the calculation formula deduced shows much more advantageous in terms of reinforced bar control and construction cost under the condition of diameter of component larger than 1 m.