LIN MING -ZHOU - Professor, Seismological Bureau of Shanghai, Shanghai, China
ZHAO ZHI-GUANG - Associate Professor, Seismological Bureau of Shanghai, Shanghai, China
FENG DE-YI - Professor , Seismological Bureau of Tianjing, Tianjing, China
YAO LI-XUN - Associate Professors, Seismological Bureau of Zhejiang Province , Hangzhou, China
YU XUE-JUN - Associate Professors, Seismological Bureau of Zhejiang Province , Hangzhou, China
HIDEMI M.ITO - Dr. Meteorological Research Institute, Tsukuba, Ibaraki ۳۰۵, Japan

In this paper, a trace-type fuzzy method for predicting follow-up significant earthquakes was worked out. Taking the earthquake sequences of ۱۲۷ earthquakes of Ms>۵. O since ۱۹۶۶ in China as the original samples of data.the inner-check was carried out for the samples by the processing method of fuzzy clustering soft division, and the fuzzy processing was conduct for earthquake category sequence beforehand. The inner-check results showed the correct prediction rate both time and magnitude can reach to ۶۹% while the trace-type correct prediction rate under the meaning of natural language was up to ۹۱%, being more effective than usual method. From the poind of view of Practicality,aforementioned method cas also be used in other districts and has some practical values.