The demand for better techniques of sizing motivated the development of studies capable to supply a larger understanding of the behavior of the geosynthetics when inserted in the soil mass. The interaction soil- geosynthetics it is complex, being function of the properties of the used materials, soil and geossintético, and expresses through the adhesion and angle of interface attrition. The study of the interaction soil- geosynthetics it can be accomplished through field test or laboratory. The field test are considered the most representative, because they simulate the conditions and the solicitations in situ more correctly. However, they are tests of high costs and of difficult execution. In spite of some such inconveniences as the sample size, the laboratory test have more accessible costs and they are executed with larger easiness. The tests usually used they are the one of pullout and direct shear (conventional, with tilted reinforcement, tilted and ramp). This work presents the development of a new equipment capable to execute three types of direct shear test (conventional, tilted and ramp), combining different test boxes and accessories. Besides the project and construction the work also presents the results of a series direct shear test being used une soil types (sand) and tree geosynthetics (one geogrids and two geomembranes), executed in the developed equipment. These results allowed the evaluation of the performance of the equipment, study of the contour conditions and comparative analysis of the interface parameters obtained through the three test types.