In order to characterize the intensity of the muzzle flash more accurately,a high speed CCD （charge-coupled device） camera was used to shoot the muzzle flash of gun propellants A and B used in 30 mm gun,and nitramine gun propellant C just-in-time,and the image processing software Image-Pro Plus6.0 was used to edit the photographs of the experiment to get the flash area,the maximum dimension of the flash,the average flash area,the average circumference of the muzzle flash,and the integral optical density (IOD). The flame temperature was calculated by Wien formula. The intensity of the muzzle flash was characterized and analyzed through the comparison of the obtained parameters. The results show that the shape and intensity of the muzzle flash can be characterized by analyzing the parameters obtained. The IOD can be used as a parameter of characterizing the geometer and radiancy of the muzzle flash.