A binary optics reflective/diffractive Schmidt telescope was designed using diffractive optical element (BOE) to replace the Schmidt corrector to correct aberrations. Using OSLO six program, we designed a Schmidt telescope with the following parametres: aperture=200 mm, F/#=1.9, wavelength λ=4.3 μm, field of view 2ω=10 degrees, and MTF≥0.4(for spatial frequency ν≤60 cycles/mm).