Abstract: Forming a scientific and reasonable index system of PEIA ( planned environment impact assessment ) is an important premise for carrying out PEIA and has very important significance to developing and improving evaluation method of PEIA． Due to the domestic and foreign researches on PEIA，through analyzing in theory and material example，SWOT analysis and DPSIR pattern were chosen to establish an indicator system containing environmental，resource，ecological and social aspects，after surveying the characteristics of physical and sociological environments． It was applied in PEIA of the Gaolan Sanchuankou industrial cluster in Lanzhou． Based on the AHP ( analytic hierarchy process) ，this paper comprehensively evaluated the planned potential environment impact in the implementation，it was expected to provide a useful reference for the formation of index system of PEIA．