Abstract: The seismometric Brigade of Sichuan Seismological Bureau made a preliminary investigation on the digging trench at the Xialatuo site along the Luhuo fractured zone, where an earthquake (M = 7.9) occurred on Feb. 6, 1973. It was found that the house remains were buried at the depth of 0.4-2.2m and 1.9-3.58m respectively during the two historical events on Mar. 24, 1923 and Dec. 8, 1816. It is reported that there occurred three large earthquakes with an intensity scale of X within 158 years. The view that "the strong earthquake (intensity of X) cannot repeat at the same place" cannot be applied to the seismic zoning.Owing to the recurrence of great earthquakes, we have studied four groups of earthquake faults occurring in 1973, 1923, 1816 respectively.