Since the open space quality and quantity becomes decline in many cities of developing countries, the research means to identify the relationship between quality of public open space (POS) and quality of life (QOL) in Medan, Indonesia. The study measured the level of satisfaction of the visitors of POS by using five scale Likert Scale. The analysis shows that people perceived ‘function’ as the most significant factor for POS and ‘health’ as the most important aspect for QOL. Thus, there is a strong correlation between quality of POS and the physical QOL.