Purpose: This study was according Minuchin's family structure theory to explore the boundary between parent and child in Taiwan college students. Method: We constructed a Boundary scale, and invested the relationship between boundary scale and family violence, family triangle.Results: The results indicate that the Boundary scale had very good reliability and validity. In addition, the boundary between parent and child had something differ between Taiwan family and west family.Conclusions: The results suggest that we will rethink the definition of family boundary, parent-child relationship and parent-child interaction behaviors.