臺灣民間盛傳許多風水傳說，其中尤以地理師報恩復仇型最具特色，內容描述：地理師幫助家庭迅速得富，卻因飽受虧待，復加報仇，致使該家族驟然蕭索的傳奇式情節(臭羊肉型)；或因誤會主人而加以陷害，最後發現真相而彌補補償，使之家運昌隆的傳說內容(雞肫厝型)。此二種風水傳說，皆有風水、考驗、交換行為等相關議題，值得綜合討論。 本文試圖以西方社會學校論點，探索「臭羊肉」型、「雞肫厝」型兩類傳說，思索地理師及主人間的互動過程，從「支付──回報──再支付──再回報」模式，解析這類傳說當中人物的社會行為活動，藉以了解風水民間傳說背後，後呈顯的社會文化意涵。 本文將循下兩個脈絡進行申論：一為探論「個人心理取向」：皆析地理師與主的利益交換行為，是憑何交換？深入思索地理師的角色定位，是否為天理代言的考驗者角色？地理師試煉方式是否只繫於一己「口欲」之私？這樣的交換行為模式何以調節與平衡？ 二為「結構集體取向」：探討風水傳說的流傳的臺灣文化情境，風水為何可以應驗之深層原因，並從巫術行為的暗示效果論探集體信仰意識的問題。再者，觀察風水傳說的流傳機制，如可交結因果報應、公理昭彰理念，在民間社會廣為流，以及這兩類風水傳說各自可能的傳承路數，所表露出之不同民間心理意義。

There are many geomantic legends in Taiwan, especially the legends of the geomantic professor repaying a debt of gratitude or taking vengeance. Two typical legends show that one is, the geomantic professor is supposed to have an influence on the fortune of a family and make them rich. But the family treat him badly; they let him eat stinking mutton. As a result, he revenges and makes the family poor. (I call the text as “the legend of stinking mutton”) The other one depicts that the family is misunderstood by the geomantic professor (The hostess has prepared the geomantic professor for much his favorite food such as chicken viscous of thick solution beforehand, but he doesn’t know that), so he performs some black magic and turns them into the poor. Finally, the geomantic professor finds out the truth, and then retrieve it. (I call the text as “The legend of chicken viscous”) Both of these tow texts have the same subjects: the art of geomancy, trial, and exchange. This paper discusses the exchange process between he geomantic professor and the family in “the legend of stinking mutton and chicken viscus” by using the theory of exchange in sociology. The process of exchange is from “pay, repay to pay again, and repay again”. Through observing the exchanged behavior in geomantic legends, were can comprehend the culture in Taiwan society. This paper explores the geomantic legends in two perspectives. One is about the individual’s mentality: what do the geomantic professor and the family exchange for? Why the geomantic professor is tested by his appetite? How to balance the exchange between each other? And the other is about community system: Why does the geomancy work in the culture of Taiwan? The paper also illuminates the problem of community consciousness when the geomantic followers hint themselves at magic. In addition, it examines how the geomantic legends combine with retribution and acknowledged justice. How are two types of geomantic oral legends produced and spread? The result do represent different meanings of the public mentality.