Abstract: Design of a wide spectrum ultraviolet-visible microscope objective was introduced. According to the dispersive properties of ultraviolet（UV）optical materials, was selected as positive lens material, apochromatic equations for distributing the optical power of each lens in double-dialyte lens were established, and appropriate deviation angles were assigned for two groups. Based on theoretical calculation with PW method and optimization with CODE-V, the longitudinal chromatic aberration and secondary spectrum were corrected, and apochromatism was achieved. Simulation results show that the radius RMS of spot diagram dispersion circle is less than 5 in the entire field of view, astigmatism is 0.058 and istortion is 0.04% at the maximum field of view for this system.