Geosynthetics have been widely used in recent thirty years for separation, reinforcement, filtration, drainage, and containment functions of the pavement design. The use and sales of geosynthetics materials are increasing 10% to 20% per year. This paper reviews research into the application of geosynthetic materials such as geogrids, geotextiles, geocomposites, geonets, geomembranes, geosynthetic clay liners, geofoam, and geocells in for strengthening of soil by focusing on the literature review, basic useful characteristics and basic information collection of geosynthetics. Among them, the study focuses on the reduction of base course thickness by using the geogrid material in the base course layer without changing the load carrying capacity and the performance of the pavement. Modified AASHTO design result shows that about 20% to 40% base course reduction is possible using geogrid in pavement design, with a greater percentage reduction for stronger subgrade materials. have been defined by the American Society for Testing and Materials (ASTM) Committee D35 on geosynthetics as planar products manufactured from polymeric materials used with soil, rock, earth, or other geotechnical engineering related material as an integral part of a man-made project, structure or system. Geosynthetics is the term used to describe a range of polymeric products used for Civil Engineering construction works. The term is generally regarded to encompass eight main products categories The most popular geosynthetics used are the geotextiles and geomembrane. Geomembrane is an essentially impermeable membrane in the form of the manufactured sheet used widely as cut-offs and liners. They are often used to line landfills.