In order to realize non-mechanical electric control for the laser beam for real-time moving target indication, a target indication system was established based on optical phased array. First, according to the principle of optical phased array and spatial light modulation characteristics, conjugate symmetric key to the default indicator diagram was added, then the calculating holography method of fast Fourier transform was used to generate holograms for tabulation. Secondly, under the charge-coupled device video capture environment, the improved Mean-shift tracking algorithm based on kernel density estimation was used to obtain information of target position, looked up in the table and loaded the holographic information to complete hologram real-time update. Finally, taking advantage of spatial light filtering characteristics, optoelectronic reconstruction step was designed, superfluous term was eliminated and the holographic reproduction process was completed. Experimental results show that the system speed is in more than 60 frames per second on 8 bit gray scale hologram and all parts to maximize effectiveness. It can satisfy the system requirements of real time, higher precision and stabilization. The theoretical algorithm and experimental results also verify the effectiveness of the system.