Geotextiles are considered to be an important part of geosynthetic family of materials. Geotextiles have extensive applications in civil and agricultural engineering. Current statistics points out to an increasing trend in the world wide use of this type of textile fabric. Therefore, acquaintance with these functional fabrics in our country and their use is necessary. In this thesis, geotextile functions and its various types together with their manufacturing methods are firstly defined. For the production of experimental samples of geotextile, polypropylene fibers were manufactured. Parameters affecting the elongation of the fibers were examined. A carding machine together with a horizontal cross-lapper was employed to make the non-woven fibrous layers. A laboratory needle-loom was also designed and fabricated. The carded layers were needled using the above needle-loom. In total forty samples of geotextile were produced. oth physical and mechanical properties, such as mass per unit area, thickness, strength( both grab and trapezoid ), puncture resistance index and grab elongation were experimentally determined. The effect of fiber parameters and those of fabric production process on properties of the resultant geotextile fabrics were investigated. Results showed that, marked improvement in the mechanical properties of geotextile occurs, when high crimped fibers are used. It was also found that, the same result is obtained when the samples were needled on both sides, using needles with long barb distance and higher penetration depth. It was concluded that, it is possible to control the grab elongation of geotextile by manipulating the elongation of the employed fibers, thus eliminating the expensive calendaring operation hitherto used for the control of grab elongation.