Aiming at the extensive application of the active laser detecting based on “cat′s eye effect” in electro optic counter reconnaissance,the relationship among the laser active detecting wavelength,the cat′s eye effect of the detected electro optic system and the maximum detection range of the detection system is researched and analyzed.The reflective index model and the maximum detection distance mathematical model are corrected,and the numerical relationship between the incident wavelength and the maximum detection distance is simulated.In order to verify the correctness of the mathematical model,taking the manufactured laser active detecting system,selecting the electro optic system of the adjusting focus,the verification experiment of the maximum detection range between in focal point and off focus is conducted.The simulated values were 1445 m and 1751 m,and the experimental values reached 1230 m and 1632 m,respectively.The result demonstrates that the simulated and experimental values of the maximum detection range are in good agreement with focal point and off focus.