Research conclusions: (1)The tremendous influence on humidification deformation by initial moisture content and compaction degree ;(2)The stress-strain relationship should behave as strain hardening characteristics under the conditions of humidification and non-soaking;(3)The shearing humidification volumetric deformation decreases with the increasing of stress level while the axial deformation increases with the increasing of stress level; Under the same stress level } both the volumetric deformation and axial deformation decrease with the increasing of average main tress; (4 ) The humidification decreases not only the strength of loess but also the strain of loess when achieving failure.