The research target is developing WebGIS. JAVA applet is used in“Browser/Applet”Two Tier Architecture. Next is the work theory of“Browser/Applet”Architecture Web GIS applet. A WebGIS software—GeoWindos Web1.0 is formed in the research. Technique features of GeoWindows Web1.0

including interface

function

data managing strategy

display controlling mechanism and so on

are introduced in the paper. The running test result of GeoWindows Web1.0 is reported.By testing

GeoWindows Web1.0 works very well in high speed Intranet

too slowly in dial up way. Some experience and thinking of author about WebGIS are given. Some differences of JAVA working in different Browsers are discussed

and the solving methods are given. The author thinks that the running speed bottleneck of GeoWindow Web1.0 is data loading speed. The importance of integrating with HTML

JAVA

JavaScript predominance in WebGIS is emphasized in the paper.