The availability of sufficient green open space (RTH) is one of the efforts to maintain the optimal quality of environmental functions. The management of green open space (RTH) is still reaping many problems in urban areas. The management of this green open space needs attention and the role of many parties. The arrangement of green open space needs to consider residential areas, public and social facilities, as well as green open space for the public. RTH facilities have started to break down, paint is peeling or dull, lighting is inadequate, and it is often misused towards negative behavior. This research was conducted to answer how to optimize the management of green open space in Banjarbaru City. The research method used is descriptive qualitative research. The research was conducted in the Banjarbaru City Public Green Open Space area that did not meet the minimum requirements of 30% of the city area. Data obtained from interviews, observations, and supporting references. The analysis includes data collection, data reduction, data presentation, and interactive conclusion making. It was concluded that Banjarbaru's green open space management planning was packaged into the "Smart Green City for Banjarbaru" planning model or called the Green City. Planning and management is carried out by two leading sectors, namely the Public Works and Spatial Planning Service (PUPR); and the Department of Housing and Settlements (Disperkim). Planning has also involved the Banjarbaru City Environmental Service.