In this paper, there was an attempt to analyze Nai耐 shown in Qin and Han''s legal, which was basically to judge Nai耐 as Nai Wei Si Ku耐爲司寇 or Na Yi Li Chen Qie耐爲隷臣妾 by comparing the punishment regulations of Nai Wei Li Chen Qie耐爲隷臣妾 and Si Kou''s case. Qin and Han''s regulations on punishment are almost clear, and it is questionable whether only Nai耐 can know whether Nai Yi Si Kou耐爲司寇 or Nai Wei Li Chen Qie耐 爲隷臣妾 only through such a difficult interpretation process. I tried to set a new standard in this paper, the viewpoint that there were clear and simple standards that anyone could easily grasp at the time. The punishment provisions of Qin and Han''s legal are very clearly stipulated almost unquestionably, and only Nai耐 must go through such an intricate interpretation process. From the point of view that there was a clear and simple standard that could be easily grasped by any official at that time. Through the case of punishment for Nai Wei Li Chen Qie耐爲 隷臣妾, I emphasized that the grounds for punishment for Nai Wei Li Chen Qie耐爲隷臣妾 were theft, beating, prisoners of war, injury, inheritance, and desertion, and that at least there were no cases of punishment for misconduct related to the public. Perhaps the crime is Nai Wei Li Chen Qie耐爲隷臣妾, and if the punishment related to the public official, especially the punishment for management related to management, Nai耐 is likely to be Nai Wei Si Ku耐爲司寇. In other words, Nai Wei Si Kou耐爲司寇 was considered to have different types and targets of punishment as punishment for general crimes other than Nai Wei Li Chen Qie耐爲隷臣妾. In addition, this paper attempted a new interpretation of the characteristics of Si Kou司寇 and Zuo Ru Si Kou作如司寇, which had been controversial for a long time, through examples of simple reading documents excavated. In this paper, it was emphasized that if Si Kou is divided into male and Zuo Ru Si Kou作如司寇 is interpreted as female, the relevant sentences of The Legal Text of Year 2二年律令 and Han Shu Xing Fa Zhi漢書刑法志 are contradictory. Based on The Legal Text of Year 2二 年律令 and The Bamboo Slips of the Qin Dynamic Collected in Yuelu Academy岳麓秦簡, if I look at Zuo Ru Si Kou作如司寇, this is correspond to Cheng Dan Si Ko城旦司寇 and Chong Si Ku舂司寇 and Cheng Dan Chung Si Ku城旦舂司寇.