Abstract: The numerical simulation and experimental study of the heat transfer performance of a sugar-alcohol-based rectangularfinned tube phase-change heat resevoir were carried out in this paper. The effects of the heat transfer fluid inlet temperature,flow rate,and parameters such as the heat exchanger fin spacing and tube spacing on the heat charging and discharging performance were investigated using numerical models. The study shows that,from the operating parameters,the temperature difference between the fluid inlet temperature outside the fin-reinforced zone and the material phase change temperature is positively related to the heat charging and discharging rate due to the influence of the thermal conductivity of the phase change material;under the condition of turbulent flow inside the tube,the flow rate inside the tube cannot significantly improve the heat charging and discharging rate of the heat reservoir when it is higher than 0.53 m/s;from the structural parameters,increasing the fins can significantly improve the heat charging and discharging rate inside the fin zone. The effect of fin spacing less than 10 mm and tube spacing less than 52.5 mm on the heat charging and discharging rate was not significant. The relevant research can provide theoretical support for the design and thermal management of systems such as building-side high proportion solar thermal storage and heating.