| Since the technique of reinforced soil appeared in 1960's, the scholars carried out a lot of researches and tests for its basic theory. Recently, the main tests for the interface characteristics of reinforced soil are pullout test and shear test. However, the academic research is more laggar than practice of engineering. It is necessary to ameliorate the method of test. We should know the interface characteristics of reinforced soil to design the frame of it. The most important parameter is the magnitude and change of friction. So the interface characteristics of the geosynthetics and soil directly determine the interior stability of the reinforced soil project. The interaction between the geosynthetics and soil becomes the most key technological subject of strengthening mechanism of geosynthetics.In order to scientifically research interface characteristic of geosynthetics, compare the characteristics of pullout test and shear test, get their relationship, we have developed and drawn the testing machine by myself according to the test demand for the geosynthetics, by the test this equipment can totally meet our request.This paper studies the interface characteristic of the geosynthetics of different specifications through shear test under the different situations of soil property. The paper analyzed the impact on the result of reinforced of different soil property, especially disturbed layers of thickness and mechanism of destruction with reinforced soil and compared the result with that of pullout test. It also studied the different closely knit degree of soil body it to influence with reinforce result. The paper provides the constructive suggestion for the production of geosynthetics and the reinforced soil engineering design through the study on interface characteristic.
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