Introduction: TEP-330N POLYOL 5000MW is a kind of high activity polyether polyol. It is a kind of fast reaction polyether polyol with high reaction activity, high molecular weight and high primary hydroxyl content. It is suitable for producing high resilience polyurethane soft foam, especially for preparing polyurethane foam, high quality cold curing polyurethane foam, self foaming foam and other uses. The results show that TEP-330N has higher activity than other polyether, and its foam has better physical properties.