The authors conduct the experimental investigations for the heat-stored and heat-rejected behaviors of Pentaerythritol solid-solid phase-change particles in the packed bed. The experimental results show that at the beginning of heating, the temperature at the inlet of packed bed goes up quickly. But the rise of the temperature slows down along with the process of heat-stored. When the temperature of Pentaerythritol reaches to its phase-change temperature, the outlet temperature keeps almost constant. As the heat-rejected process begins, the temperature of the heat-stored materials decreases sharply at the inlet of packed bed, and drops very slowly at the posterior section of packed bed. The temperature of each spot in packed bed drops with increasing time, and besides, the temperature in the middle section is high and is low at the two sides of the test section. It spends nearly 4 hours to reject well all the thermal storage in the packed bed. In experiments, the sublimation phenomena can be obviously observed. After experiments, a portion of the heat-stored material has been lost.