Nowadays, the need for different kinds of naturally occurring construction materials is increasing in the road construction industry. One of these materials is laterite but does not usually meet the specification to be used as pavement material for heavy traffic load due to their shortages of sand and having higher plasticity. The focus of this study is to use treated laterite soil as base course construction materials using cement and quarry dust on the samples collected from Kunzila junction –Horticulture farm - Zegie town road project. Three sources were taken from the study area and each of them has been subjected to geochemical tests. In the first phase of the investigation, the engineering behavior of the soils for each sample was investigated, the second phase of the investigation was focused on examining the possibility of using combined laterite soil as pavement material, the third phase of the investigation was focused on examining the possibility using of cement-treated laterite soil as cement stabilized pavement material with the addition of 2-12% of cement, the fourth phase of the investigation was focused on examining the possibility of using quarry dust treated laterite soil as quarry dust stabilized pavement materials with the addition of 10-50% of quarry dust and in the last phase of the investigation, cement as well as quarry dust stabilization were carried out simultaneously in which 2-10% of cement and 10 - 50% of quarry dust were blended with laterite soil. Based on the laboratory test result, the geochemical characteristics indicate that the blended material is pure laterite. The laterite material fulfilled the CBR and PI requirements when stabilized with 12% cement for the base course regardless of having out values beyond the specification. The laterite stabilized with 10% up to 50% quarry dust alone does not fulfill the requirements of base coarse material. It was found that the natural laterite material can be used for base course construction by stabilized it with a combination of 8% cement + 30% quarry dust for CB2 base course. Keyword : Laterite, Cement, Quarry dust, Stabilization, Base course