To reduce signal crosstalk and bending loss in few-mode fibers while increasing the effective mode field area, a few-mode fiber with a ring core and lateral hole auxiliary structure was designed. Theoretical analysis of the effective refractive index distribution, bending loss, and effective mode field area of this fiber was conducted. Using the finite element method, the impact of fiber parameters on the minimum effective refractive index difference between adjacent LP modes, mode field area, and bending loss was calculated. The minimum effective refractive index difference between modes can reach 1.7×10^-3, and the mode field area for all modes is greater than 106μm². When the bending radius is 28mm, the maximum bending loss for each mode is only 10^-11dB/m. This structure features a large mode field area, low inter-mode crosstalk, and better bending resistance, extending the research ideas for space-division multiplexing.