The strength parameters of sliding zone soil are indispensable factors for stability evaluation and countermeasure design for landslides. Based on the previous study results, the shear tests on sliding zone soil derived from Xuecheng landslide, located along Zagunao river, Sichuan province, are conducted as follows: first the sliding zone soil is consolidated; then large displacement ring sheared, then consolidated again, and last ring sheared again; and the strength characteristics of sliding zone soil of the reactivated landslide are simulated and clarified. The method for determining and se...