To understand the professional dilemma in the protective services the study began with the controversial child sex offense case from the domestic violence prevention center, Taipei county. The study used unstructured focus groups assembled by 29 social works from the domestic violence prevention centers in 8 cities to understand the professional dilemma and decision of protective social service workers. The study concluded that the ”Taipei county case” not only has become a collective traumatic experience, but also impacted heavily on workers' moral and professional attitude. The study also discovered various decision patterns among workers because of the uniqueness of protective social services.