The paper introduces the soil shear strength, introduces the common experiment methods of soil shear strength in projects, analyzes the respective relationships among six experimental methods and physical definitions of various strength coefficients according to the differences in drainage by consolidation conditions in the triaxial shear and straight shear tests, so as to select the shear strength coefficients and ensure the reli-ability of soil analysis results.%对土的抗剪强度理论作了简述，介绍了工程中常用的测定土的抗剪强度试验方法，根据三轴剪切试验和直剪试验时固结排水条件的不同，分析了六种试验方法的对应关系及不同强度指标的物理含义，以合理选用抗剪强度指标，保证土体分析结果的可靠性。
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