A novel color encoder which has dual function of a beamsplitter and a beamshaper is proposed. This encoder could acquire higher diffraction efficiency and very good uniformity of light field with high diffraction efficiency. An algorithm combining tracing algorithm, G S algorithm and Y G algorithm is used to design this encoder. The result by computer simulation shows: the diffraction efficiency is up to 93.3%, and the non uniformity is less than 0.01%. And a new approach to encode and make a phase element by using color-printer techniques is also proposed.