Based on As2Se3 and As2S5 glasses, an all-solid microstructured optical fiber with simple and easily drawing structure, and two zero-dispersion wavelengths in the mid-infrared is designed. Its effective refractive index, effective mode area, nonlinear coefficient, dispersion and group velocity are numerically simulated by the finite-difference time-domain method. The result shows that dynamic adjustment of the two zero-dispersion wavelengths can be realized in the mid-infrared, and the second zero-dispersion wavelength can shift to the maximum wavelength of 7388 nm. The space between the two zero-dispersion wavelengths can continually be changed from 2706 nm to 3773 nm. This work provides a theoretical guidance for the application of nonlinear fiber optics.