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It is very important to protect the natural environment. Presenting environmental information to the public with the intention of enhancing the understanding of the environment and promoting environmental awareness requires the creation of a new type of environmental information system for the general public(PEIS). The eco-geochemistry information is main information that the public wants to obtain and comprehend through the WWW. Through a practical case study, the eco-geomistry information system to publish in the web is explained in detail. The functions of the system include map display, map output, data query, statistical analysis, environmental evaluation, etc. The paper introduces the technique of Flex and MapGIS K9 IMS, and how to integrate these technique. The principles and methods are not only applicable to the eco-geochemisty information system, but also to any other information system sharing information in the web.