Recently scholars have revealed the relationship between Zhang Taiyan's study of Chunqiu Zuozhuan in his early period and the theory of the New Text School (Gongyang xue). However, the related analyses have more often than not overlooked the contents of Chunqiu Zuozhuan du, which represents the achievement of Zhang's study of Chunqiu Zuozhuan in his early period. Therefore, this article focuses on Chunqiu Zuozhuan du, discussing the relationship between Zhang's study of Chunqiu Zuozhuan and the theory of the New Text School, so as to reveal the contradiction between qiushi "pursuing truth" and zhiyong "practical applicability" in Chunqiu Zuozhuan du, and how it inspired Zhang's change of view towards his study of Zuozhuan.