This study evaluated the effectiveness of the HOPE program. Participants included 120 Chinese new immigrant parents with preschool children in Hong Kong from 13 preschools which were randomized into intervention group (HOPE) and comparison group (6-session parent education program). Parent participants completed measures on child behavior, parenting stress, social support and self-efficacy before and after intervention. The children were assessed on the WPPSI-R and receptive vocabulary before and after parent intervention. Results indicated significant decrease in post-intervention child behavior problems and parenting stress and increase in social support in the intervention group, compared with the comparison group. Implications for service delivery for parents of preschool children were discussed. (Contains 5 tables and 1 figure.)