Abstract: This paper analyzed the heat transfer process in the inside melting of ice storage tank which in along-arranged and cross-arranged.We proposed the corresponding simplified assumptions,and on this basis,established a nine bundle model.ANSYS simulation study was also studied on ice storage tank which in the different arrangement with the different pipe diameters.It obtained that diameter effect on heat transfer of ice-storage tank is relatively small,tubes in-line arrangement,which not only simplified layouts and enhanced the heat transfer characteristics,but also met the requirements of uniform temperature pattern,was better than staggered style to the performance of ice storage tank.