2022年诺贝尔物理学奖授予非定域量子纠缠和贝尔不等式基础检验的研究. 以此为背景，本文分析量子力学中的各种非定域性，推导条件概率满足的贝尔不等式，进一步理解量子力学违反贝尔不等式的本质．

In 2022, the Nobel prize in physics award researches on the nonlocal quantum entanglement and basic test of Bell inequalities. Under this background, this paper aims to analysis various non-locality in quantum mechanics, to derive the Bell inequality satisfied by conditional probability, and further to understand the nature of violation of Bell inequalities in quantum mechanics．