Based on the energy storage problem for solar energy utilization and the advantages of spiralSgroove tube heat exchanger, spiralSgroove tubes were used in the solar energy phase change heat storage. Using spiralSgroove tube as water flow pipe and phase change material as heat storage medium, building the three-dimensional model by Gambit software and meshing by ICEM, the heat storage process in the spiralSgroove tube and smooth tube heat storage were numerically simulated while the heat transfer enhancing effect was investigated. The influence of structural parameters such as groove pitch and groove depth on the heat storage process was simulated numerically and the influenceSrules were analyzed. The results show that the convective heat transfer intensity and heat transfer capability were enhanced when the smooth tubes were substituted by spiralSgroove tubes in the phase change heat storage and the heat storage time became short. In the range of this paper, the optimal structural parameters of spiralSgroove tube is groove pitch p=7mm and groove depth e=0.4mm.