This paper will brief you on establishment of one kind of GIS system-PURSIS （Peking University Remote Sensing Information System） on microcomputer

IBM PC/XT

AT

and simply explain its basic characters

functions for data processing

digital data formats

picture data base system and expert system. Based on the idea of modular programming

we should organically combine many thematic GIS

each of them becoming a subsystem. The data collected and stored by GIS can be shared b’y any subsystem. The main system is composed of some share processing modules

which is the share software resource by the users. In this paper

we also introduce some techniques for the organization of the system

basic conception of the expert system

data encoding

color display for the picture on the IBM PC

etc.