This artiсle This article provides information on the study of physical and mechanical properties of soils in the design and construction of engineering structures in the Republic of Uzbekistan. As a result of the research conducted in the facilities in the desert regions of our country, when the saline soils are moistened and the water seeps for a long time, it is shown that the actual subsidence of the existing structures has increased by 1,5-2,0 times compared to the project.