A study about strength of typhoon is the focal point in typhoon study field at present, and is short of forecast ability on it, especially when typhoon strength happen sudden change. When typhoon intensity changes abruptly over coastal waters, it will lead to major disaster because of unprepared or cause a waste of property leaded by the excess defense. There is still a lack of study about sudden weakened typhoon currently .So, in order to advance the forecast ability about typhoon strength, it is n...