本文主要围绕笛卡尔“我思故我在”这一哲学原理展开,笛卡尔以不可置疑的“怀疑”为工具对以往哲学体系进行考察,最终得出作为怀疑主体的“我”的存在,从而构筑起自己的知识大厦。但在笛卡尔本身的论证过程中我们发现,怀疑的存在性实际上并不保证主体“我”的存在性,只是笛卡尔将作为天赋观念的“我”先验的至于他的整个论证之中了,所以“我思故我在”的合理性是值得探讨的。 This paper mainly focuses on the philosophical principle of Descartes “I think that I am here ”. Descartes inspected the previous philosophical system with the undoubted “Doubt ”, finally came to the conclusion that “I ”The existence of, thus building their own knowledge building. However, during Descartes’ own argument, we find that the existence of doubt does not in fact guarantee the existence of subject “I ”, but that Descartes will be “a Throughout the argument, so ”I think so I am" reasonable is worth exploring.