Phase change material (PCM) has been widely used in thermal management for its high latent heat and low price. However, further development of its application is limited by the low thermal conductivity. Oscillating heat pipe (OHP), an effective thermal transfer device, can be used to enhance the heat transfer of PCM and then improve the thermal performance. In this paper, both novel 3D-OHPs and regular OHPs were hired for PCM thermal performance enhancement. PCM coupled with two kinds of novel 3D-OHPs (4 layers 3D-OHP and 3 layers 3D-OHP) system and PCM coupled with multiple 2D-OHPs system were experimentally investigated. Results showed that the paraffin wax/3D-OHP system needed more time for completely melting of paraffin wax than paraffin wax/OHPs system. The temperature of wall and paraffin wax in the former system was lower during melting process. In the solidification process, both two systems performed better than paraffin wax only. The solidification time of the paraffin wax/4 OHPs system was about 0.48 times than that of pure paraffin wax and the paraffin wax/4-layers 3D-OHP only 0.29 times, which meant that paraffin wax/3D-OHP system had better performance. (C) 2018 Elsevier Ltd. All rights reserved.