Resident relocation to flats policy becomes a strategy of the Jakarta Provincial Government to overcome illegal settlements and slum areas. The relocation is also aimed to improve the quality of life, particularly of the children. This research analyses the determinant factors of the quality of life of children who are moved to the flats due to the relocation. This research uses the Kid-KINDLR questionnaire to collect data of children in the range of age 7-13 years and the Z-score method to process the data and to build an analysis. The Z-score > 0 indicates a good quality of life, while Z-score < 0 is otherwise. The result shows that 48% of the children have a good quality of life and 52% of the children have a poor quality of life (mean = 91.45 and SD = 9.559). There is a positive correlation between the quality of life of children and the pattern of nutrients intake of children (r = 0.053, p = 0.518), the education of the head of the family (r = 0.058, p = 0.478), and the household income (r = 0.070, p = 0.401). Whereas, the negative correlation between the quality of life of children and the number of family members (r = -0.088, p = 0.284). This research argues that to increase the quality of life of children, the facilities in the flats must be built properly for the growth of the children. In addition, family involvement must be improved to provide a high quality of nutrients intake for the children.