A holographic three-dimensional display method of virtual and real scene based on the combination of digital hologram (DH) and computer-generated hologram (CGH) is proposed. Firstly, the lensless Fourier transform digital hologram is used to record the three-dimensional information of the real scene. Secondly, the sampling frequency of DH is transformed according to the pixel interval of spatial light modulator. Then high pass filtering, scene scaling, in-plane rotation and translation operations are performed on the transformed DH in the frequency domain. Finally, the CGH of virtual scene is calculated by bipolar intensity method. In the calculation, the processed DH is taken as the initial value of bipolar intensity superposition, so as to realize the fusion of real and virtual scene holograms. The color dynamic holographic three-dimensional display system is built to verify the proposed method by experiments. A commercial 4K projector employing reflective liquid crystal is reformed, and the color dynamic holographic three-dimensional display of 30 fps is realized. Experimental results show that the proposed method realizes the efficient fusion of DH and CGH, and provides an effective way for dynamic holographic three-dimensional display of virtual and real mixed scenes.