The Baodaihe fault is the main seismic rupture zone of 1954 Shandan earthquake(M=7¼), which shows rig ht-lateral strike slip movement with a small portion of dip-slip component. The fault is about 4.5 km long. For the first time, three paleoearthquake events can be identified in the trench cross the Baodaihe fault. According to the 1 C 4 and TL age date of the strata in the trench, the first event occurred later than 3 120±250 a B. P., the second one took place approximately 2 500±1 70 a B. P., and the third one occurred later than 2 150±170 a B. P., the recurrence interral of great earthquake alo ng the fault is approximately 350~700 years.