Abstract: As hyper-spectral cameras have been widely used in many fields such as industry, agriculture, scientific research, military, etc, it is urgent to develop the effective countermeasure, laser active suppressing jamming is presently one of the most effective technologies to cope with hyper-spectral cameras. Double-Gauss optical system was taken as an example; first of all, the laser propagation in every lens was analyzed based on the propagation theory of Gaussian beam's q parameter, and the energy distribution on the photosensitive surface of the system's detector was obtained. The influences of laser launch parameters were subsequently investigated on the energy distribution. The results show that the laser spot on the photosensitive surface decrease with the increase of laser and hyper-spectral camera's distance, however, with the increase of laser waist there is a minimum in the whole variation trend of laser spot. To achieve the better laser jamming effect, the minimum should be avoided in designing the laser waist. The research fruit can provide the theoretical basis and technical support for carrying out the experiment of laser jamming hyper-spectral imaging system and optimal design of laser launch parameter.