Abstract: Based on ArcGIS,the object-oriented programming language and components development technology were used to make a secondary development of the region ecological security evaluation system.The system model,system function and function modules were designed.By establishing ecological security evaluation index system,synthetically analyzing the regional ecological situation and simulating the ecological process,the intellectualized assessment for regional ecological security Was achieved with the developed system,which provides scientific basis and decision support for decision-makers to carry on regional environment management and comprehensive control.Finally,this system Was applied to the ecological security assessment of experimental area of Donning lake,and the pressure index,condition index and response index WaS obtained.The results indicate that the system have a good evaluation function.