This study draws upon an ecological perspective to examine parental involvement in homework and its relationship with primary school children's educational outcomes within the Chinese sociocultural context of Hong Kong. Data were collected using homework diaries and questionnaires administered to 1,309 pairs of students and parents spanning all six primary grade levels in 36 primary schools in Hong Kong. Results show that primary children across grade levels devote a substantial amount of time each day after school to homework assignments and revision, while parents' involvement in the homework process varies. Such variation in parental involvement is found to relate to the child's grade level as well as the parent's educational attainment. Gain in children's academic efficacy with higher parental involvement level is observed among junior primary students as well as those with parents of lower educational attainment. Implications for the school's role in involving parents in the homework process are discussed. (Contains 3 tables and 2 figures.)