Abstract: The social services for the vulnerable children in U.K and U.S.A are based on the Demand classifications. The social services include various services for the looked-after children, the leaving children, the disabled children accessing short breaks and the homeless children, and the social workers have unique advantages, such as individualization, precision, emergency, and moral motivation.the concept of technocracy is obvious during the assessment on the social work service for the vulnerable children. However, there are shortcomings for the technocracy, such as lacking of individualization and overall response, the neglect of ethics, and bothering service objects. There are three implications of the perspective of technocracy on the development of the social work in China. Recognizing the disadvantages of putting too much emphasis on scientific methods and index and balance the scientific and artistic quality of the profession, strengthening the participation of the demand side in the assessment process and giving more professional support and multiple care to the front-line social workers in China.

Key words: vulnerable children, social worker, technocracy