The Hakka area of southern Fujian (Minnan/Hakka area hereafter) is the place of origin of the northern Taiwan Taoist tradition, which arrived in Taiwan nearly two hundred years ago. According to John Lagerwey;s research, it may well have been introduced here around 1820 by the ancestors of the Lin clan of Nanbi from Zhao'an County. Working on the basis of Lagerwey’s research, the author undertakes an in-depth field investigation of Zhao’an and the neighboring counties of Raoping, Nanjing, and Pinghe, all of which are mixed Minnan/Hakka areas and linked to the origins of the northern Taiwan Taoist tradition. Through comparison of various ritual traditions, this study intends to deepen our understanding of such Taoist origins and to discuss their transformations in the Minnan area and Taiwan. The present article is a case study of a three-day jiao (Taoist ritual), in which the author participated from beginning to end. It gives a thorough description of the entire ritual process, provides ritual scripts and Taoists’ explanations, and places special emphasis on the important procedures. With an overall survey of Taoism in the region, the author also attempts to illustrate the demarcation between schools of Taoist ritual tradition of northern Taiwan and their possible origins.