Rapid human population explosion in urban area has been causing some issues. The issues not only the decreasing open space area caused by high land demand for residential area, but also environmental pollution that is characterized by increasing air temperature caused by the increasing number of motor vehicles. Green open space in residential area is one of the potential solution to those issues. Metland Menteng is a residential area that has been provided by green open space in its area. The

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... rposes of this study are to evaluate the trees ecological function in Metland Menteng's green open space and to give recommendation to improve trees quality for the future. Trees evaluation has been done in some study areas, which are Valeria cluster, Teresta, Savana, urban forest, and the clusters main road. The aspects evaluated in this study are the trees ecological function as noise buffer, natural shading (temperature modifier), humidity controller, and windbreaker. Trees samples are analyzed and evaluated by comparing their characteristics in the study area and the criteria from the literature study using the parameter of key performance index (KPI). Result shows that each of the trees has different ability of its ecological function. The score of ecological functions on the very excellent and excellent categories are showed by the total percentage as follows: 65,64% for noise buffer, 74,9% for natural shading (temperature modifier), 44,21% for humidity controller, and 98,55% for windbreaker function.