Extended Abstract 1- Introduction      Today the concept of cites is unimaginable without different green spaces. In cites and specially big and industrial cites green spaces have differ functions. So green space has caused to improve cities environments in one hand and it has been provided appropriate situations for spending free times in other hand. The importance of urban green spaces can not be ignored in cites sustainability, physical and natural effects on urban systems and different ecological, economical and social outputs. By this approach green space can be defined as external place by significant vegetation and semi natural regions.      Tabriz urban parks and parks under construction involve 1174 hectare. This figure is significant compared to other cites in Iran. Although this figure seems appropriate but most of the parks under construction are located outside of urban areas. There is no similar access to these parks so the chance to visit is reduced. In this article the manner of aces to urban parks has been analyzed by network analysis method in GIS and the results have been compared by Buffering analysis method in GIS under Spatial Analysis.   2- Methodology      In this article the network analysis and buffering methods have been used for evaluating spatial distribution of Tabriz urban parks. In network analysis method the parks are considered as central places and links are routs connecting citizens to urban parks. Nodes are intersection of links. Urban maps in scale of 1:15000 and Spot satellite images have been employed in order to define case study district (Tabriz), identification and drawing and establishment of urban passages and parks layers. In this relation the primary databases for network analysis and buffering of establishment and mapping of urban passages (highways, main and secondary streets and alleys) and also service centers (urban parks) have been extracted. Each extracted map was converted to criterion map in GIS for analysis. GIS was employed in order to enter data. The Auto desk map (2009), Arc GIS 9.3 and Excel were used for entering and saving of the data and designing of GIS database. The studied zone urban passages network was drawn in Auto desk map (2009) then it was entered in GIS and the topology was specified in Arc catalog then by new network extension and the passages network was prepared for analysis in GIS. The constructed layer for urban parks was entered into GIS. The confines were applied by software Network Analyze. The UTM was selected for all maps based on limitation of network analysis and according to this fact that the technical transportation sped of a person during walking in normal case is estimated in range of 0.75-1.2m/s. The speed of a person was considered 1.1m/s in this research. The speed of a person and route traveled from home to park has been the basic of this research.      Buffering in GIS under Spatial Analysis is other method for comparison with network method. This method and its scope can be beneficial in simple analyses and in general view of a researcher. The confine for urban installation and servicing is considered 800-1000 meter. In this research it is 800 meter.   3- Discussion       Straight Line Distance was used for establishing limit for green space in Tabriz. It is a common function of spatial analyst. It is useful in finding near Straight Line Distance and map of competency level. But from the author view point it can be beneficial in establishing air routes .According to green space limit in Tabriz there are areas in coverage of green space limit but there is no standard in access and servicing (universal standard). Since accesses and barriers can be …