Green function in a green open space (RTH) cities as 'lungs' of the city, is one of the aspects of the functioning of recycling, the gas carbon dioxide (CO2) and oxygen (O2). More than this, there are still a lot of open space functions including aesthetic functions that are useful as a source of public recreation, actively or passively, which is embodied in the system of green corridors as a means of controlling the spatial or land in a city green space system. In this study, using the High Resolution image from Google Earth recording June 5, 2012, Salatiga Land Use Map, Road Network Map, and River Network Map of Salatiga. In addition, we use non-spatial data such as population data, number of livestock, and the number of motor vehicles Salatiga. The method used was digitized on screen. The results of digitization is to facilitate the image interpretation, especially of green space and other oxygen-producing vegetation. RTH types examined in this fieldwork is the urban forest, green lanes, cemetery, river banks, protected areas and open space underneath Privat. Salatiga has 910,58 Ha of green open space which consists of 72,37 Ha of Forest City, the Green Line 4.09, 53,19 Ha Cemetery, River Border 259,51 Ha, 104,81 Ha protection area underneath, and 423,08 Ha RTH Private. In addition, this study also interpret non vegetation oxygen-producing green open space consisting of Dryland Agriculture area of 2779,43 hectares, 327,26 hectares of Plantation and Agricultural Wetlands 895,52 Ha.In this study, using the High Resolution image from Google Earth recording June 5, 2012, Salatiga Land Use Map, Road Network Map, and River Network Map of Salatiga. In addition, we use non-spatial data such as population data, number of livestock, and the number of motor vehicles Based on population, Salatiga city need green open space in wide 372,174 ha. So that when viewed from the RTH has wide 910,58 Ha has met. However, when viewed from oxygen needed, Salatiga require 3452,174 hectares of green open space. Thus, there is wide open space that have not met the needs oxygen. However, when coupled with non RTH vegetation producing oxygen, oxygen-wide into 4912,79 Ha. Thus, there has been widespread meet the minimum oxygen supply.