In is paper investigated and confirmed the Deposit of bentonite clay on the studied road section of Osh-Isfana. Osh-Isfana road is an international meaning road. The road is located in the Nookatsky district of Osh region of Kyrgyz Republic and connects the two regions and gives access to the territory of neighboring States – Tajikistan and Uzbekistan. Overestimation of the roadbed with moisture is an extremely dangerous phenomenon, since the strength of the pavement and the stability of the slopes of the mounds and excavations are greatly reduced. When designing the basis of the road on collapsible soils are equally important inside the event with the aim of reducing the likelihood of soaking the soil. The recommendations on the use of local building material as a waterproofing layer of the road structure, interrupting the movement of moisture, while ensuring the removal of water from rain and snow melt.

Keywords: slope, water-heat regime, sediment, moisture, waterproofing material, X-ray spectral analysis, shale clay, bentonite clay