Using optical window cat-eye effect, the laser active detection is easily influenced by laser wavelength. A chromatic aberration theoretical model of the transmission-type cat-eye effect is established. The detecting laser wavelength doesn’t match with the operating band of transmission-type cat-eye system, which generates the chromatic aberration, so the influence of chromatic aberration on laser active detection is analyzed. An experiment is designed to validate the theoretical analysis results. The results indicate that the generated chromatic aberration results in the focus shift, the echo divergence angle is obviously increased and the received echo power is decreased. The conclusion is that the detecting laser wavelength should match with the operating band of the transmission-type cat-eye system.