Abstract: Early intervention research on disadvantaged children deserves attention. In the United States, it serves not only as an important means for the government to help disadvantaged, but also as an crucial approach to promote equality in education and society. Hundreds of large-scale such studies have been carried out in the United States, among which one of the most famous and oldest is "the Chicago Parent-Child Center Program". In China, researches of such sort started late with focus till today on introducing special children intervention and many lack relevant policy support and evaluation supervision. On such an account, American experience enlightens us: 1) the project design needs the guidance of scientific theory; 2) its implementation should build an ecological intervention system with appropriate culture; 3) the evaluation, together with the analysis is the scientific basis for making policies on children's education and welfare.

Key words: comparative study, early intervention, children in disadvantage, child welfare