This paper presents basic approaches and principles of structural design for Geographic Information Sys tem (GIS)

and discusses compositions of system.basic contents and characteristics of softwares for the system

developmental environments of the system.and building principles of systematic models

Meanwhile

withthe systematic theories

the author expounds operational principles of information system

including the ideamodels of data bese for GIS

set operations of geographic space data

loped operations of data for graphicaand images

etc. Finally.the author makes a thorough inquiry for basic logical opeatious and operational ioms of GIS.