Purpose: The national long-term care insurance system supports elders using home services. The purpose of this study was to examine effects of this system on powerlessness, family support and elders' health promoting behavior. Methods: Participants were 92 home care service users. The questionnaire included general characteristics, powerlessness, family support and health promoting behavior. Data analysis was conducted using t-test, ANOVA, and Pearson correlation coefficients with SPSS 21.0. Results: Mean score for powerlessness was 2.86, for family support, 3.52, and for health promoting lifestyle, 2.27. There was a significant difference in level of powerlessness for number of diseases. Family support had a significant difference according to education, health insurance, cost of living, and number of diseases. Health promoting behavior had a significant difference for gender, perceived health status, cost of living, and number of diseases. There was a significant relationship among powerlessness, family support and health promoting lifestyle. Conclusion: Study findings show that powerlessness in home service users is relatively high and that family support and health promoting lifestyle are low. Therefore appropriate support programs should be developed based on the health care needs of elders and families using the national long-term care insurance system home service.