Many structures that have been constructed on gypsiferous soils have big problems, especially in drying-wetting sequence, contrast of construction on non-gypsum-soils due to the collapsibility of gypsum. These soils are formed by the evaporation of saline groundwater when the water table is near the ground surface. Gypsiferous soils are widespread in the Middle East especially in regions peripheral to the Red sea and Arabian Gulf. They cover large areas of Iraq which may be extended to 20% of the total Iraq\\\'s area. The present work condenses on the effect of soaking and leaching progresses on the soil stability in the saturated and unsaturated conditions

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