This paper starts with a brief comparative of various types of heat storage technologies, then analyzes the role of heat storage technology in DSM， mainly introduces the high temperature phase-change thermal storage technology and products.After that, a successful application of high temperature phase-change heat storage system in an enterprise in Jiangsu is also informed.By using this new technology, the enterprise in the off-peak hours made the heat storageand in the peak hours release the stored energy for manufacturing industrial steam.It has a good effect on reducing heating costs and improving power grid peak and off-peak time load user difference.