Researches in Taiwan earlier on the relationship between Mothers-in law and Daughters-in law always place very emphasis on solutions to the causes of the static conflict. The quest for harmony (i.e. Superficial Harmony) is the basic operating principle of Chinese culture and the ethical relationship between Mothers-in law and Daughters-in law. Otherwise, besides Superficial Harmony, Genuine Conflict apparently has influences on the interactions between Mothers-in law and Daughters-in law. In order to get the research in perspective, the thesis makes the best of “the Dynamic Model of Harmony and Conflict for Interaction among Chinese People” (Huang Lili,1999) to draw a distinction of variety between Superficial Harmony and Genuine Harmony resulted from Genuine Conflict and then, proposes suggestions to build a model of the quest for Harmony on the Relationship between Mothers-in law and Daughters-in law. The results of qualitative study utilizing this model show that there are four types of Genuine Harmony: Rapport Type, Affiliation Type, Traditional Role-fitting Type, and Modern Role-fitting Type, and three types of Superficial Harmony: Segment Type, Alienation Type and Inhibition Type among interpersonal relations between Mothers-in law and Daughters-in law. Compared types of Genuine Harmony with types of Superficial Harmony, maintaining the superficial harmony, in the beginning of mutual interactions, is the most chief and common choice to preserve relations from conflicts. Better relations can be brought about by performing of their mutual duties as mothers-in law and daughters-in law and the addition of the dying down of their autistic conflict; meanwhile, a genuine harmony relation grows up next. While mothers-in-law and daughters-in-law are free-will to do something affectional and heartfelt for one another, harmony of their pleasant and genuine relationship can be continued in conclusion, and autistic conflict can also be resolved at the same time.