Abstract: The academic circles have not yet settled the argument on the time of Jian'an Four Scholars, namely CHEN Lin, RUAN Yu, LIU Zhen and XU Gan, submitting themselves to CAO Cao at present. On the basis of historic record and comprehensive investigation of the literary creations of the four scholars, the author in this paper draws the following conclusion: CHEN Lin submitted himself to CAO in Jian'an the 10th year, RUAN Yu submitted himself to CAO in Jian'an the 2nd year, ZHEN Liu submitted himself to CAO in Chu...