Abstract：To investigate the deformation features of unsaturated soil under compression with humidifying,the experiment research on the related factors of soil compression deformation has been finished under a lateral restraint. These related factors are initial water content,loading and the seePage point. The test results show that the unsaturated soil humidifying compression has a close relationship with initial water content,humidifying time,seePage value and seePage point under the action of load. The higher the initial water content is, the shorter the time of soil deformation happening is; the seePage value increased as humidifying time growth; the larger the load acting on the soil is,the greater the deformation of soil is. There are three stages in the humidifying process and these stages can be controlled. The research results are useful to eliminate the curvature deformation effects of ground surface in mining area and to balance the force action of soil and foundation,as the research has theoretical and practical significance in mine.

Keyword：unsaturated soil;lateral confinement;humidifying compression;