Children/youths protection cases and their families have various needs and problems needing assistance and help. Therefore, if a comprehensive and continuous family treatment service is to be provided, the integration across related organizations has to be done. In order to enhance the cooperative efficiency among local children/youths protection case work teams across related organizations, this study utilizes four times' discussion data of a focus group for analysis, which is taken from ”The study on the construction of the children/youths protection service and resource network platform” conducted by the author of this study. It is hoped that from the points of view of practitioners, important factors for enhancing cooperative efficiency could be found. After four times' discussions of the focus group, it is found that the focus group has gotten consensus on the issue of cooperation under the policy support; however, if some modification and adjustment could be done, cooperative efficiency would be improved. Therefore, based on the discussion results, important factors for enhancing cooperative efficiency are summarized as follows: (1) To clearly define the service role function of every organization in the work team (2) To thoroughly carry out the work model of case management (3) To design children/youths protection evaluation tools including high-risk family concept (4) To integrate service recording forms (5) To establish case service information system (6) To establish and keep open communication attitudes (7) To formalize cooperative relationship among organizations