How to determine the criteria of good quality public open space depends on what people needs which relates to interaction and people perception (Kallus, 2001). Some studies on QOL and its relation to physical elements of urban space carried out by measuring people satisfaction (Campbell, 1976; Marans, 1988; Salleh, 2008). From Merdeka Square case study it is found that most people believe that public open space influence their physical health (90.8%), psychological comfort (89.2 %), social interaction quality (88.3 %) and economical value of property (85.6%). Majority people interviewed state that they are ‘satisfied’ (47.5 %, score 4) and ‘very satisfied’ (8.3 % score 5). There are 37.5 % of respondents state ‘neutral’ (score 3) with their whole life. Satisfaction level of some aspects of QOL such as family life, education, income and health, shows that the mean score is higher than ‘neutral’. The lowest level of satisfaction found in the urban environment aspect which means the score is 2.84 (see Table 2).