The mid-infrared(MIR) spectral region(3~5 μm) is of an increasing interest in current earth observations,and has many advantages compared to the visible regions.However,for the received radiation energy of satellite sensor at the daytime,there is energy coupling of reflected radiance and emitted radiance,which makes it a difficult task to take advantage of the MIR data.The ground brightness temperature T0g without solar radiation was calculated based on a calculation model like the split-window technique.And then the inversion model for MIR land surface bidirectional reflectivity of VIIRS was derived based on MIR radiation transfer model.The results show that theoretical inversion value of reflectivity is consistent of actual value,RMSE is only 0.009 at the solar zenith angle of 0°.Because the inversion model is little affected by meteorological factor and instrument noise,these influences can be neglected in practical applications.