Based on the characteristics of quality scalable video coding(SVC),a fast inter encoding algorithm is proposed for the enhancement layer of coarse grain quality scalability(CGS).Firstly,according to the base layer macroblock mode and rate-distortion,the order of the current macroblock coding mode was proposed,and then based on the residual coefficients distribution,the spatial correlation,the residual coefficients,and rate distortion decisions were proposed,respectively.Finally,the macroblocks w...