Set in the urban Taipei city, the present study aimed to illustrate factors that made families vulnerable. We interviewed 10 social work supervisors who were knowledgeable about the family situations of these families in the Taipei city. The transcripts were analyzed and we concluded four risk factors making family vulnerable, including lack of problem solving skills, lack of resources, financial problems (unemployment), and physical and psychological health or impairment, and three dimensions that were mostly included in the family evaluation, including environmental safety, quality of care, and child learning outcomes. Implications and limitations are discussed. Recommendations are also provided about risk assessment for vulnerable families in the urban settings.