In this paper

the five first-class constituent elements of engineering geological environment are analyzed

which include material composition

geological structure

dynamic effect

boundary condition and engineering geological properties;The four assessment information characteristics of engineering geological environment are summarized

then a GIS-based engineering geological environment assessment system workflow is established

which consists of four parts

i.e.Multi-source data system

GIS management system

GIS-based assessment system of engineering geological environment

risk assessment and prevention decision system of engineering geological hazards.After that the importance of assessment information normalization is discussed and two assessing models i.e.hierarchy analysis model and information weight model are introduced

and finally the GIS structure for engineering geological environment assessment is presented.These researches provide a theoretical basis for engineering geological assessment.