Abstract: In this paper, one of the interaction processes between the mid-and low-latitude systems——hardrain storm process caused by interaction between the westly trough and the far distant typhoon was analysized and a model was presented. The characteristics and the role of the SE low-level jet between typhoon and pacific subtropic high especially the connection between SE low-level jet and the westly high level jet were revealed. The differences contrasted with Main front low jet were discussed. It was showed that the hardrain storm front, which was generated by the interaction between the cold air in westly belt and low-level jet in company with typhoon, possessed particular three-layers structure. It was emphasized that this particular structure of front may be an important characteristic feature of the hard rainffall bearing systems.