Aiming at the problems of near-eye display system such as small field of view, bulky, poor flexibility, and poor mass production, the design method of adding free-form surfaces and polydimethylsiloxane (PDMS) groups to the system is adopted. First, the design requirements and working principles of the flexible near-eye display optical system are discussed, and the initial structure is established. Then analyze the reasons for the stray light of the system. Then use XY polynomial free-form surface to replace the traditional aspheric surface to correct system aberrations. Finally, a cylindrical waveguide was used to simulate the bending of the waveguide, and the optimization analysis of the bending of the flexible waveguide was carried out, and a near-eye display optical system with flexible bending ability, large field of view and high imaging quality was designed. The designed working wavelength of the near-eye display system is 400~700nm and a pupil diameter of 8 mm, field of view is 30°, and a thickness of 1.5mm. At a cut-off frequency of 71lp/mm, the field of view Modulation Transfer Function (MTF) value is greater than 0.1 and system distortion is less than 5%, in cases where the waveguide deformation bending radius is greater than 500mm, the modulation transfer function value of the full field of view is greater than 0.1 at the cut-off frequency of 15lp/mm, and the system weight is about 22.8g.The design results show that the design achieves the miniaturization, light weight and flexibility of the near-eye display optical system, and can be applied to a new generation of helmet display systems.