Research On Layout Optimization Of Urban Park In Xi’an Based On GIS And Landscape Pattern

City Park is a very important part of the urban green space system, as the city’s development and urban issues grim, more and more people pay attention to it. C ity Park acts as an important role in improving human settlements and urban environment, and the pros and cons of the park layout directly affects the accessibility and landscape-connectivity, which affects service fairness of urban park for residents.City Park is an important way of urban residents in touch with nature, but in the past the city park is mainly in accordance with the service radius to planning and layout, without considering the actual situation, although the accessibility of urban park GIS-based for optimizing the layout of the park provides a new scientific basis, taking into account the practical problem of resistance, it ignores the role and ecological linkages of the city park. The layout of the city park there are still some shortcomings and problems. This paper attempts to combine the study of accessibility of urban parks with the theory on landscape ecology patch-corridor- matrix, to establish two simple models, to optimize the layout of the city park to provide better evidence and recommendations, through GIS analysis functions.In this study, the literature at home and abroad, which about the park layout, accessibility of urban park s, and landscape pattern,was analyzed to explain the relevant theoretical knowledge, such as the conception of urban park, the development of urban park and classification; GIS technology and GIS buffer analysis, overlay analysis and network analysis; the conception of landscape and landscape ecology and patchcorridor- matrix landscape elements theory; urban planning theory and sustainable development theory. This paper point of view was presented according to the analysis of the literature, which combined the accessibility of parks and several landscape indices to analyze the layout of the city parks. The theoretical foundation and technical methods of the study was established.This study identified the central city of Xi’an to the study, collecting and organizing the data about the distribution of Xi’an city parks, residential land, and transit network, establishing geographic database through Catalog, and then us ing network analysis function to analysis accessibility of Xi’an city parks and landscape pattern on the ArcMap platform, drawn up the chart of service area of the city parks and Xi’an city simulation greenbelts and greenways distribution, and then the results were analyzed to discover the problem, increased park green patches in the districts which lack of parks, designed the green corridors between the green parks nodes according to the actual situation, gradually formed urban green space network system, the study obtains the results and suggestions of Xi’an urban parks optimized layout, but also provides references to construction and renovation of Xi’an urban parks and Xi’an urban planning.