Abstract: Considering the insufficiency of conventional observational means in mining area ecological monitoring,after summarizes the contents,technical indicators and evaluation model of the ecological monitoring,the system of monitoring and assessment for ecological in mining area was designed based on 3S technology.In the Microsoft.Net environment,the ArcEngine GIS component,IDL and C^# language were used to implement and integrate the system.The system debugging was execution with a case mining area,the results show that the system can be operated steadily and also can provides important technical support for mine land reclamation and ecological reconstruction.