Safety and security of the community is only achieved when there is a common agreement and understanding of certain norms related to it. Safety of public space, such as streets, squares and parks are very important for the community for continuity. These public spaces are created in tandem with the ebb and flow of human exchange. The vitality of public space is characterised by the frequency of its usage. Public open space is part of the urban structure that forms the core of the city. It is difficult to conceive a public space without its social dimension to provide context. This paper attempts to examine the quality and safety and security in Merdeka Square Park, a popular public open space in Medan. A mixed method technique was used in this research to determine safety and security of public space. A total of 120 respondents and 10 kiosk vendors were interviewed, and a survey was held in a selected area of the public space. Findings showed that security and safety of a public space have a strong impact on the community..