The paper focuses on the using of causative markers “教 (jiao)” and “交 (jiao)” from the view of the using of word variants, which is to reveal the standardization of words in the Ming Dynasty. This paper uses Jinpingmei (two versions), Shuihuzhuan (three versions), Qingping Shan Tanghua Ben, Gujin Xiaoshuo, Zhongyi Zhiyan, Xunshi Pinghua as references. This paper finds that: Using as causative markers, the standardized writing form “教 (jiao)” and the variant writing form “交 (jiao)” are mixed more frequently in Jinpingmei Cihua Ben, Shuihuzhuan Rongyutang Ben and Tianqi Keben and Qingping Shan Tanghua Ben than in Jinpingmei Chongzhen Ben, Shuihuzhuan Guanhuatang Ben and Gujin Xiaoshuo. This reveals the standardization of words in the Ming Dynasty. Both the internal factors of language and the external factors influence the disappearing of “ 交 (jiao)”.“教 (jiao)” are completely dominant in both Zhongyi Zhiyan and Xunshi Pinghua, which is closely related to the characteristic of this two documents.