The article is about risk assessment and control of the family care to minors in low-income families in Beijing，in order to provide reference for preventing minors-growth difficulties. The research methods include sampling survey and in-depth interviews，which respondents involved 5 streets，5 social workers and 40 low-income families. According to the survey data，family care of minors is described from the daily life，education，company，communication，respect. On this basis，the risk assessment of minors-growth is involved with physical health，personality development，moral development，parent-child relationship and social interaction. After analyzing the cause，the advice to improve the system of family care is put forward.