The new encryption scheme for digital color image have been proposed. the image can be encrypted through encryption matrices generated with tent map chaotic sequences to XOR color matrices many time. the R, G and B components of the color image can be treated and cipher image becomes much unifrom. because the chaotic sequences are estremely sensitive to the initial values, even if there is a littke wrong in keys, any useful information of the original image can not be obtained. the specific experiments confirmed the validity of this scheme.