Abstract: Based on the characteristics of natural and cultural environments of Xingyun Lake Basin, the main ecological environment problems, the ecological safety spatial  pattern and its optimization in Xingyun Lake basin were analyzed using the principle and method of landscape ecology, entropy method and GIS spatial analysis technology. The  factors such as altitude, slope, soil erosion intensity, susceptibility of geological hazards, land cover(use and vegetation coverage), population density, distance from the  natural ecological protection zone, construction land and the water source were selected as the resistance factor to generate comprehensive resistance element. Basin ecological  corridor and ecological node were established to optimize the structure and function of ecological network in basin by using the minimum cumulative resistance model(MRC) on  theory of GIS spatial cost distance. The results showed that:(1) from the perspective of the area ratio and the average index of ecological security, the area of moderate level  security accounting for 4581%, the area of high level of security accounting for 2524%, the area of Lower level of security accounting for 2105%, the area of Low level of  security accounting for 79% of study area. Average ecological safety index in Xingyun Lake basin was 295, the ecological security and ecosystem health as a whole was in  moderate level. But the ecological level of security is low in some areas else that mainly distributed in the southern, Eastern and northern regions. The factors such as slope,  water resource environment, water and soil loss, and disturbance factors of human activities such as Land use pattern, distance from construction land are the main factors to  form the ecological security pattern of the basin.(2) An ecological security network pattern with structured and hierarchical consists of Central Ecological sources, core  ecological source and general ecological source, multiple levels ecological corridor and ecological nodes was established. The ecological corridors and ecological nodes in  different levels and ecological source structure were discriminatively constructed and protected that will effectively enhance the integrity and function value of basin  ecosystem, and then it will be helpful to enhance stability and security of basin ecology.
Key words：entropy method; GIS spatial analysis; minimum cumulative resistance model; ecological security; Xingyun Lake basin