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(Purpose)In order to reduce the nonlinear effects in optical fiber effectively and make the energy output of the light beam much more uniformly,a flat-top beam-shaping device based on micro-structured optical fiber(MOF)has been designed in this paper.(Methods)Output of flat-top fundamental mode is realized by introducing a low refractive index inner core in the refraction-guiding MOF.Based on this principle,output performance of the flat-top MOF is simulated and analyzed with the Rsoft.(Results)The structure parameters of the flat-top MOF are obtained after optimization,and the diameter of the corresponding mode field is 10.37 μm,and the defect degree is 0.16%.(Conclusions)These results show that the flat-top fundamental mode with large mode area can be carried out in the designed MOF,and moreover,they also provide theoretical basis for the fabrication of the flat-top MOF.