Abstract: Increasing urban expansion leads to vunerability of numerous cities to problems such as flooding, earth quake, security indicents, and smog catastropy. Citysafety has increasingly drawn attention from researchers, governments and general public worldwide, and consequently safety oriented urban planning gradually emerges. In this paper, based on data of land use, population statistics, traffic network data and green shelter data,use landscape pattern index, multi-scale analysis, network analysis tools and proximal area method to make spatial analysis in ArcGIS10.2 and Fragstats (ver 4.2.1) software platform. then besed on above calculation result to built similarity model of City Safety and evaluate similarity of city security environment from the perspective of St Petersburg and Dalian city landscape pattern,we found in St Petersburg city and Dalian city security environment,landscape pattern of population density is high similar,the landscape pattern of land use is middle similar,landscape pattern of traffic network is low similar,,landscape pattern of green shelter is not similar. by comparison,St Petersburg shows advantages in traffic efficiency and the accessibility of green shelter. Dalian shows its advantages in spatial distribution of three functional land use "industry-live-green space" and the centrality of population and transportation network, In the future,in construction of urban safety space,Dalian should focus on improving traffic efficiency and the accessibility of green shelter to enhance urban security.