This study is concerned with the solidification heat transfer characteristics of phase change energy storage system. The heat transfer characteristics experiment for the solidification of PCM is performed on the PCM cylindrical heat exchanger with six fins. Experimental results are compared with the theory to investigate the appropriateness of heat conduction equation of PCM and the effect of coolant inlet temperature and flowrate on the total solidification time of PCM are investigated. Experimental results are in good accordance with the theory and they show that heat transmission enthalpy model is sufficient for the analysis of solidification heat transfer characteristics of PCM. The total solidification time of PCM in two dimensional finned PCM cylinder is shortened 5-6 times than that of PCM in one dimensional PCM cylinder. The total solidification Fourier number is correlated with Biot number and Stefan number as following.