Abstract: The relationship among tension, shear stress and strain of geosynthetics is analyzed by means of pull-out tests. By using the shearing resistance stiffness coefficient G existing at the reinforced soil interface, a pull-out coefficient E_r that relates to the tensile modulus E_r and G, is established, and thus the formulas for stress distribution and the relative displacement along the geosynthetics are derived. The feasibility of the formulas is confirmed by comparing with the existing experimental data. Then the stress transmission way of geosynthetics with the increase of tension and the influence of α on stress distribution of geosynthetics are analyzed. It is shown that α can be better used to reflect the influences of many factors such as stress, friction and soil properties on the tension of geosynthetics. In the structure of reinforced soil, the proposed formulas are better to estimate the tension of geosynthetics under small displacement.