A series of issues such as resources exhaustion,soil degradation and environmental pollution caused by rapid population growth,accelerated urbanization and unreasonable development and utilization to natural environment have brought great challenges to the eco-security situation.In consideration of the social,economic and environmental characteristics,we attempted an integrated assessment of the ecological security in Zhangjiakou Rigion of Hebei Province by employing the pressure-status-response model(PSR).An integrated assessment model of regional eco-security and corresponding indicator system were given according to the levels of socio-economy and environment of the study region.Through determining 29indexes,building sample matrix,using dimensionless processing and determining the index weights with AHP method,each index value was computed by comprehensive index method and then the integrated eco-security index for each index was obtained.Results suggested that overall the eco-security index for every county increased by 0.035 6between 1987and 2009.The average eco-security index for Bashang Plateau region was 0.006 0higher than that of NW Hebei depressed basins.The evaluation result fits well the actual situation and can reflect the regional ecological problems and eco-security status.