Head Start Program was created to provide comprehensive health, social, educational, and mental health services to disadvantaged preschool children and families. This paper looks through the history and characteristics of the program. But previous studies find mixed results on its benefits and there still exists a general lack of consensus about the contributions of the program to the improvement of disadvantaged preschool children in the health, social, educational, and mental terms. On the basis of program evaluation, this paper makes the following six policy suggestions to improve the program: (1) increasing funds to disadvantaged children and families, (2) paying more attention to children and families in need of special care, (3) making more collaborative efforts between Head Start Program and other programs serving children and families, (4) developing more various programs through multicultural and multilingual efforts for diverse groups of children and families, (5) providing more home-based Head Start Program services to isolated families and children with disabilities in rural areas, and (6) developing better strategies to ensure that children eligible for Head Start Program receive benefits.