Abstract: With Leeb hardness tester as the research object, the influencing factors and practicality of Leeb hardness tester in engineering application were studied. The results show that there was little difference between the test results of the two modes of ST (steel and cast steel) mode and SS (stainless steel and heat-resisting steel) mode of Leeb hardness tester, and the mode selection had little effect on the actual work. The Leeb hardness test results also had little difference when the test surface was polished or ground by a flap disc, and the test surface state would not cause too much impact on the test results. Compared to Brinell hardness tester, the detection error of Leeb hardness tester was larger. So when the field hardness test is carried out, if possible, Brinell hardness tester is recommended to use.