提出了一种近零色散平坦微结构光纤(MF)。运用有限元法(FEM)，研究了空气孔直径和间隔对光纤色散特性的影响。通过控制空气孔间距和孔直径，可以实现宽波段内的低平色散传输和大的模场面积。当空气孔直径d=0.73 μm，空气孔间距Λ=2.2 μm时，在1.22～1.80 μm约600 nm的波长范围内，光纤的色散系数D的值仅介于±1 ps/(nm·km)之间，且有三个零色散波长1.26，1.51和1.76 μm；当d=0.73 μm，Λ=2.3 μm时，在1.20～1.65 μm约400 nm的波长范围内，D的值仅介于-2～4 ps/(nm·km)之间，且有一个零色散波长1.24 μm等。

A microstructured fiber (MF) with closing-zero flattened dispersion is proposed. The effect of air hole diameter and hole-pitch on dispersion of fiber is analyzed by the finite element method(FEM). By optimizing the air hole diameter and hole-pitch, closing-zero flattened dispersion and large mode area can be realized in a very wide scope of wavelength. When the air hole diameter d=0.73 μm and the air hole-pitch Λ=2.2 μm, the wavelength is from 1.22 μm to 1.80 μm, the dispersion parameter is only within ±1 ps/(nm·km) in a 600 nm wavelength range, and three zero dispersion wavelength with 1.26, 1.51 and 1.76 μm can be achieved. When d=0.73 μm, Λ=2.3 μm, and the wavelength is from 1.20 μm to 1.65 μm, the dispersion parameter is within -2～4 ps/(nm·km) in a 400 nm wavelength range, and one zero dispersion wavelength with 1.24 μm can be achieved.