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As the mainstream method of in-situ testing technology, static penetration testing is widely used. At present, the implementation of a large number of projects must be based on its test results. It also makes us have to pay attention to the reliability of its test results. In this paper, based on the previous experience and combined with the static penetration data in Hefei area, the reliability of test data is studied. The abnormal data in the static penetration data is eliminated and the influence of the abnormal data on the calculation results of correlation distance is expounded.