Abstract: A new true-colour rainbow holography of 3D object with single-wavelength laser is presented in this paper.The technique needs only conventional optical system of rainbow holography.Based on the multiple-wavelength colour rainbow hologram of 3D object, and using the principle of reversibility of light, the question of automatically counterpoint of the three primary colours images is resolved.The method given in this paper has practical value for 3D true-colour embossing hologram.Satisfing experimental results are obtained in corresponding experiments.