Collapsible soil is broadly classified as a loose and cemented soil with low degree of saturation that is susceptible to a large and sudden reduction in volume upon inundation, stress or/and vibration. Related to increase in natural water content, these soils go through radical rearrangement of their particles, causing sudden changes in the stress-deformation behavior which causing differential settlement of foundation which can leads to foundation failures and worth of damages under ground public facilities and infrastructure. In this study, the investigation program developed to establish their different behavior under wetting in two phases; field and laboratory work. The obtained results is useful in mapping the trend of the factors affect in evaluating soil collapsibility or collapse potentials which encountered in construction with volume loss problems. The major factors are the nature and type of the soil particle and the sedimentation mechanism, which combine to produce collapsibility. The field collapse potentials measured for all tested sites are smaller than those measured in the laboratory for the same undisturbed samples by 15%. Also, evaluate the collapsibility rate.