赵世炎入党时间既是一个组织问题,也是一个学术问题。对赵世炎何时入党问题学术界有三种看法。一种认为赵世炎1920年5月赴法之前在上海由陈独秀介绍入党。另一种认为是1922年6月旅欧少年共产党成立后入党的。第三种认为是1921年3月巴黎小组成立后入党的。本论文认同赵世炎的入党时间是1921年3月说法。 Zhao Shiyan join the party time is not only an organizational issue, but also an academic issue. There are three opinions on the academic circles when Zhao Shiyan joined the party. One thinks that Zhao Shiyan introduced the party by Chen Duxiu in Shanghai before he went to France in May 1920. The other is believed to be joining the party after the establishment of the Communist Youth League in June 1922 in Europe. The third thought was the March 1921 Paris Group to join the party after its establishment. This thesis agrees with Zhao Shi Yan’s time of joining the party in March 1921.