Abstract: Face to the precise signal guidance application of small fully polarimetric phased array radar, in order to reduce the design and debugging complexity of traditional T/R phased array antenna and feed system, and meet the needs of low power consumption, low insert loss, low cost manufacture, low profit phased array antenna, a liquid crystal holographic coding phased array antenna is proposed. One-dimensional holographic electronically controlled scanning phased array antenna is composed of miniaturized holographic radiation unit, slow wave structure and parallel plate waveguide feeding system. Making use of mature LCD panel manufacturing process, a holographic coding phased array antenna is constructed by controlling the deflection state of the liquid crystal molecules under the holographic radiation unit to adjust the resonant frequency of the antenna. Deterioration of sidelobe performance caused by coupling effect is reduced by holographic optimization algorithm and voltage grade control based on a real object processed and tested, and the optimal control of antenna pattern is achieved by the gradient decreasing search algorithm and the optimization algorithm of the appropriate objective function. The measured results indicate that the beam scanning angle of the antenna reaches ±49°, and after optimized algorithm, the beam pointing angle accuracy reaches 3°, the sidelobe suppression level reaches 1.7 dB.