Abstract: Gypseous soil is one of problematic soils to be used as foundation of road, building and other structures. It is considerably strong and has good properties when it is dry. The problem appears when constructing heavy buildings or hydraulic structures on these soils after wetted by water from rainfall or from the raising of water table level from any source and leaching the salts from the soil. The primary objective of this paper is to presents the current state of the gypseous soil subject to leaching. A review is provided aiming to discuss the effect of gypsum content and leaching on gypseous soil.