There are 27 valid amendments in the US Constitution. The first ten amendments are called the Bill of Rights by later generations because their main content involves the basic rights of ordinary citizens and restrictions on government power. The amendment made a general declaration of the constitutional rights that were not explicitly enumerated in the first eight amendments, in order to ensure that the unlisted rights were guaranteed by the Constitution, and later known as the“reserved rights clause”. The so-called“traditional source”, this article from the historical point of view, analyze its natural rights, politics, textual origin, and then understand the essence of the amendment.