In order to make sure the security and reliability of color image in t he process of transmission,this paper presents a method that laser speckle and a 4-dimensional Lorenz hyper chaotic system are mixed and applied to the color image encryption.At the same time,it constructs a speckle hyper chaotic encryption system. This system realizes chaotic encryption by making bitwise exclusive or the origi nal color picture and nonlinear chaotic sequence from hyper chaotic system.Then by making bitwise exclusive or c haotic encryption image with physical random laser speckle image to achieve speckle encryption,the encrypted color image is generated.Its key space is 10¹⁰¹ and the average correlation of adjacent pixel is 0.0004.The results demonstrate that this method has a good encryption effect,it can resist the statistical attack,has large k ey space,strong key sensitivity and weak correlation of adjacent pixels.