This study examined the reliability and validity of the Family Affluence Scale (FAS) and explored the relationship between FAS and health in a general adolescent population of Taiwan. Our data was obtained from a 2009 school-based survey. In total, 3,368 students (1,741 boys, 1,627 girls) in grades 6-10 in Kinmen County, Taiwan completed a modified WHO Health Behaviour in School-Aged Children (HBSC) questionnaire. Indicators of the family's social position were their parents' occupation and education. Indicators of material affluence were number of cars, number of holiday travel, whether the participant had his or her own room and number of computers (FAS items). A higher proportion of the participants completed the four family affluence items than their parents' occupation and education items (98% vs. 90% and 88%; respectively). Analysis of the FAS showed a moderate internal reliability (Cronbach's alpha = 0.35). The associations between the FAS scores and parental occupation and education were moderate (P less than 0.001). Consistent gradients were found for the association between FAS and positive health and health promoting behaviours. In conclusion, the Taiwan version of the FAS had a high completion rate and moderate internal reliability and external validity. The clear associations between the FAS and health indicators confirm the findings of previous studies and suggest that the FAS can be used as an additional measure of socioeconomic status among Taiwan adolescents.