Abstract These study probes into the role expect variations between the mother-in-law and daughter-in-law. This study divided into two phases. At first phase, we interviewed mother-in-law and daughter-in-law to conduct “the mother-in-law and daughter-in-law expect role to each other questionnaire.” Second phase, we examine purpose sample the mother-in-law and daughter-in-law in Taichung city, the sum effect questionary is 204, data analyze in describe statistics, one-way ANOVA, t test. The major findings are listed as follows: 1. There is specifically variation in “hard currency predominant” opinions between the mother-in-law and daughter-in-law. (1) In “to have a son to carry on the family name” opinions, there is specifically variation between the mother-in-law and daughter-in-law. (2) In “daughter-in-law goes home” opinions, there is specifically variation between the mother-in-law and daughter-in-law. (3) In “the mother-in-law and daughter-in-law stay wit each other” opinions, there is specifically variation between the mother-in-law and daughter-in-law. (4) In “manage household affairs” opinions, there is specifically variation between the mother-in-law and daughter-in-law. 2. There is the same in the “refuse to accept “opinions between the mother-in-law and daughter-in-law. (1) The mother-in-law and daughter-in-law both identify “one of us” opinions. 3. There is general common view in the “refuse to respect “opinions between the mother-in-law and daughter-in-law. 4. There is particularly divergence view in the “according to conventions” opinions between the mother-in-law and daughter-in-law. (1) In “care and rear to grandchild” opinions, there is variation between the mother-in-law and daughter-in-law. (2) In “long-term patient care” opinions, there is variation between the mother-in-law and daughter-in-law. 5. There is the same in the “care and accept “opinions between the mother-in-law and daughter-in-law. (1) The daughter-in-law opinions in “bow to the mother-in-law” and “attend to the mother-in-law’s need and thought” opinions, there is variation between the mother-in-law and daughter-in-law. (2) In “give and coaptation” opinions, there is variation between the mother-in-law and daughter-in-law. This outcome could provide recommendations follow-up studies at mother-in-law and daughter-in-law role expectation. Keywords: mother-in-law, daughter-in-law, role expectation