在心理测验过程中，有些受试者往往会说谎，作假答案，导致测验结果失真。本文使用逻辑推理的理论，探讨了在测验量表中设置“逻辑陷阱”来捕捉说谎者的方法。详细论述“逻辑陷阱”的测谎原理、设计方法。并给出具体推理过程的数学描述和证明。 During the psychological test, some subjects often lie and make false answers, which leads to the distortion of the test results. This article uses the theory of logical reasoning to explore ways to set up “logical traps” in a test scale to capture liars. Discusses in detail the principle of polygraph of “logical trap” and the design method. And gives the mathematical reasoning and proof of specific reasoning process.