As a problem unsolved in the academic history of the Qing Dynasty, whether Dai Zhen had betrayed his tutor Jiang Yong has long been in heated debate. In order to make it clear, we should focus on the investigation of the period when they were together, Dai Zhen＇s definition about friend and tutor, the way Jiang Yong addressed Dai Zhen, and the studies of other scholars about their relationship. According to the different points of view since Qing Dynasty and the new findings about this issue, the following conclusion should be closer to the historical truth： Jiang Yong was a tutor and friend of Dai Zhen. This finding will lead to an objective and impartial comment on Dai Zhen and will be meaningful to a comprehensive research about Dai Zhen＇s thoughts.%作为清代学术史上一大公案，“戴震是否背师”长期以来为学界所争议。综合考察这个问题，可着重考证戴震与江永交游时间，戴震本人对师友的定义和江永对戴震的称呼，以及其他学者对江戴关系的论述。研究清代以来诸家主要观点及这一问题的新进展，比较符合历史事实的结论是：江永与戴震属于师友关系。这一结论对客观公正地评价戴震，以及对戴震思想的整体性研究都具有现实指导意义。
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