Fudezhengshen, the god of land managing and the crops, belongs to one kind of natural god worship. It has the deepest local color among the natural god of Taiwan folk believes. Fudezhengshen not only plays a important cultural role in the development of settlement, the tribal culture, the wasteland which the society relocate people to reclaim, and so on but also is a big element in the construction of the settlement culture. Therefore, Hakkas settlement culture's development and the grandfather's elder brother's belief is inseparable. In this article, the author investigates the grandfather's elder brother's belief of Hakka's settlement-Miaoli Gongguan Town. By actual field investigation and collecting oral material, the author researches into the content and the cultural behavior of the grandfather's elder brother's belief at Miaoli Gongguan Town, so as to construct the cultural and multiple interaction between Hakka's settlement and the grandfather's elder brother belief.