Abstract: We prepared 50%-80%OD/ZIF-8 composite phase change materials（PCMs）with the octadecanol（OD）as core material and the ZIF-8 as a supporting material. SEM images results show that the octadecanol was absorbed in the pore of ZIF-8 by capillary adsorption force,the loading of OD can reach 80%. XRD and FT-IR analysis showed the octadecanol and ZIF-8 were only physically combined with no chemical changes. DSC results show that the 80% OD/ZIF-8 composite PCM is heated-cooled at 60 ℃ for 50 times,the latent heat of was no significant decrease,Indicating the 80% OD/ZIF-8 composite PCM has excellent thermal stability. In addition,according to the thermal conductivity of 80% OD/ZIF-8,the fluent simulation was used to verify the influence of accumulator.Furthermore,we study the influence of heat storage by rearrange the tube bundle and addition fins.