Based in DPSIR Environmental Impact Assessment in Land Use Planning of Longnan City

With the research of the land use planning revision about Longnan,Gansu Province as an example,its planning target was calculated and the status of land use of Longnan was analyzed.Using Grey prediction,Trend extrapolation,Average growth rate,various land use types in Longnan planning area was predicted.In order to assess the current of the implementation of land use planning results and based on the booklet about environmental impact assessment,a probing study was made about the procedure,environmental impact identification,indices and assessment method of land use planning environmental impact assessment.The influencing factors of environmental impact assessment were analyzed in land use planning systematically,combined with physical circumstance of Longnan,and indicator system for environmental impact assessment was established in land use planning.This was divided into three levels chief target hierarchy,standard hierarchy,indicators hierarchy,total 20 factors in indicators hierarchy.It also built a method to construct indices system through improved entropy.It was attempted to calculate the norm weight of the indices.It could provide method for the further work of environmental impact assessment.