Abstract: Liquefaction discrimination is the premise of preventing and mitigating liquefaction disasters. There are differences among the discrimination formulas, but there is no quantitative evaluation method for differences of existing formulas. In this paper, the difference between CPT-based liquefaction discrimination formulas under CSR framework is studied, and a new quantitative evaluation method for the difference of the liquefaction discriminant formulas under the international general framework is established. The rationality and feasibility of the new method are demonstrated from the perspective of statistics and measured data. With this new method, the quantitative evaluation results of the difference of existing CPT-based discriminant formulas are presented. The evaluation results raise the understanding of the differences in liquefaction discriminant formulas and the new method can provide technical support for evaluating the differences and interoperability of the CPT-based liquefaction discriminant formulas, and also can provide guidance and reference for studying the differences and interoperability of liquefaction discriminant formulas under other in-situ tests.