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The mechanical properties of metal materials are studied by indentation method in this paper. The elastic-plastic curve of indentation experiment is obtained by fitting the representative stress and strain points, and the theoretical elastic-plastic curve is described by the power index equation of three parameters. After optimal coincidence of two curves, the yield strength, strain hardening index and elastic modulus of the material are obtained. Taking DX56 steel as an example, which has good deep drawing property for automobile, the mechanical properties of the steel are tested by indentation method and compared with the results of uniaxial tensile test. The error of tensile properties is small, so the indentation method can be used to detect the mechanical properties of metal materials.

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