In order to solve the intermittent problem of solar energy, it is often combined with phase change heat storage technology. Compared with traditional sensible heat storage, phase change heat storage can increase the heat storage energy several times or more, which has great research and application value. In this paper, the heat transfer mechanism of phase change heat storage and research methods in strengthening solar phase change heat storage technology were summarized and analyzed, such as transforming heat storage structure, adding ribs, using phase change capsules, filling multiphase change materials, adding high thermal conductivity materials to the heat storage material and so on. Results showed as follows: in the phase change heat transfer mechanism, the melting process mainly considered convective heat transfer, and the heat transfer in the solidification process was dominant; the use of ribs, phase change capsules, etc., mainly increased the ratio of the phase change material contact surface to the heat storage body, thereby improved heat transfer; the addition of high thermal conductivity material to the heat storage material can improve the agglomeration, tuberculosis and service life of the phase change material, thereby improved the thermal conductivity, and the effect of adding the foam metal was most remarkable.
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