Abstract:The Baige “10·10” slide generated large volume of cracking zones outside the boundary of its source area, of which part slipped and caused the “11·3” slide. The extent of the cracking zones further developed after the “11·3” slide and there still exists great possibility of another landslide to occur and block the Jinsha River. Therefore, in 2019 landslide geology was further investigated and field instrumentation, such as borehole inclinometer and pore water pressure, was implemented in the cracking zones. The results indicate that: 1) the bedrock in the landslide area is mainly tectonic mélange of gneiss in the Jinsha Suture Belt, intermingled with carbonaceous slate, marble, and intruded ultrabasic and acid rocks. The bedrock alteration and weathering played important roles in the development of the slides. 2) The scope of the cracking zones has been developing from the occurrence of the “11·3” slide to June 2019. Zone C1 has extended about 500 m reaching the Baige Village, Zone C2 over the hill ridge for～130 m, while C3 remains basically unchanged. As for the magnitude of deformation, the “11·3” slide-triggered one is the largest, it then slows down. 3) In the cracking zones C1-1, C2 and C3-1, the shear bands at depth are well developed and their depth reached 18 m, 67 m and 22.5 m and their averaged deformation velocity is 20, 0.29 and 3.33 mm per day respectively. 4) No stable water table is observed in the cracking zones and the deformation is not well correlated with rainfall. 5) The deformation in the cracking zones is still developing without any sign of stop. Close attention should be paid to the zones C1-1 and C2-1 in the future, especially for the development of cracks and the disintegration of the rock lump at their toes.