Soil erodibility is a key factor for soil estimation erosion through modelling techniques. Data from soil maps are often utilised to generate soil erodibility maps, for planning soil conservation measures. The purpose of the present study was to determine the erosion factor and predict soil losses due to water erosion in the Oued Lahouir basin situated in the north-eastern part of Algeria. Top soil samples were taken from a depth of 0-20 Cm of the 50 selected points. Field surveys, physico-chemical analyses and geostatistical processing, confirm the erodibility of certain soils in this region. These processes are likely to have a very negative impact on the Ain Dalia dam, by clogging its supplement from this river. The results of the soil analysis were interpolated using geostatistical methods ,ordinary Kriging (OK). The soil texture was clay, sandy clay and sandy clay loam. The organic matter content was estimated at 10.1%. The obtained erosionability indices indicate that most of the values are below 0.30. These relatively low index values show that the cause of erosion in the study area may not be due solely to soil properties, but could be the result of other factors such as the intensity and duration of rainfall. At this stage of the study, the soil erodibility map can be useful in designing techniques and building conservation structures that can minimise erosion in the catchment.