FMCW (Frequency Modulated Continuous Wave) radar has many advantages, such as low power consumption, low cost, light in weight and so on. It has a broad prospect of development. Meanwhile, threedimensional (3D) imaging technology of radar can provide important feature information for target recognition. However, the rotating targets will induce the deviation of the range profile and phase changing in FMCW signal, which has an effect on the interferometric 3D imaging. In this paper, the interferometric 3D imaging technique for rotating targets in LFMCW (Linear FMCW) radar is studied. The echo modulation effect and phase chaning caused by rotation is analyzed. The distortion of coordinates caused by echo modulation effect in interferometric 3D imaging is solved. The method of interference 3D imaging processing in LFMCW radar for rotating targets is proposed. Simulation results show that the proposed method improves the interferometric 3D imaging results of the rotating targets effectively.