This paper proposes a new photonic crystal fiber (PCF) structure for or bital angular momentum mode transmission.The fiber consists of a central air hol e,a high refractive index annular zone and a cladding.The cladding layer is com posed of a circleof elliptical air holes and several circles of fan-shaped air h oles which are arranged in a periodic manner.Without additional doping,a high refractive index annular region can be formed between the central air hole and t he cladding air hole to transmit OAM beams.The transmission characteristics of the PCF have been simulated by based on the finite element method.It is found t hat the limiting loss of each mode is maintained at 10－6 dB/m~10－10 dB/m at 1.55μm.The dispersion values of all modes in C-band are kept belo w 310ps/(nm×km) ,and the dispersion change of HE2,1modes in 1.5μm~1.6μm band is 3.31ps/(nm ×km).The maximum Δnneff at 1.55μm can reach 4.83×10－3.Large effective refrac tive index difference can effectively restrain the degeneracy between modes and avoid coupling of HE and EH modes into LP mode.It is verified that the proposed fiber has good properties such as wide bandwidth,large effective refractive in dex difference,small and flat dispersion,low limiting loss and low non-linear coefficient.A total of 34OAM modes can be effectively transmitted in the 1.25μm~2μm band.Each mode can be used as an independent channel to transmit infor mation.It can transmit a large amount of data in a short distance,which may gr eatly improve the system capacity and spectral efficiency of the optical communi cation system.