Great capacity of operations and truncation error are the shortcomings of DCT in video codec recommendation H.263. An integer transform that is suitable for H.263 is designed based on lifting scheme, float-point DCT being replaced by integer DCT,and the measure of quantization being modified. The structure and performance are compared among integer transform、float-point DCT and fixed-point DCT,showing that integer transform is a nice transform with the advantage of perfect compression effect, free of float-point operations and fewer arithmetic operations.