The correlativity of extinction coefficients at different wavelengths was obtained by Mie scattering theory and the laser multipoint fault measuring techniques. The atmospheric extinction coefficient at the wavelength of 1.06μm was measured with the laser remote sensing back scattering hazemeter made by ourselves. Then the extinction coefficients at the wavelengths of 0.532μm， 0.86μm， 1.57μm and 3.47μm were inversely calculated real-timely with the correlativity of extinction coefficients at different wavelengths. They were compared with the measured extinction coefficient at the wavelength of 0.532μm. The results show that it is feasible to inversely calculate the infrared radiation atmospheric transmission and establish the infrared radiation real-time atmospheric transmission correcting model with the correlativity of extinction coefficients at different wavelengths.