Abstract: A high resolution ultraviolet/visible wide band microscope objective used for target detection was designed. This system with numerical aperture of 0.4, magnification of 10 times, image height of 4.7 mm, imaging wavelength range of 248 nm-656 nm, used fused silica and CaF2 to calibrate the achromaticity caused by wide band. Through the system structural design and the aberration, the cut-off frequency of transfer function curve could achieve 3 600 lp/mm,which was close to the diffraction limit. The resolution was less than 0.65 m. The root mean square of spot diagram was less than 0.650 mm. Curvature of field was less than 0.01 mm. Distortion was less than 0.5 m. This system can complete dual-band exploration mission of near ultraviolet and visible light.