| The research works on crop composition and distribution. Its chief goal is to optimize the agricultural resource and gain the maximum economic effectiveness. It emphasizes on applying mathematics modeling technology and computer technology to research the establishment of group decision support system. The group decision support system combines Internet technology, 3S technology, group decision technology and also Web GIS technology. The main advantage of this system is that it can break through the traditional meaning of primitive agricultural product decision. The Web GIS has prominent features: powerful space data-analyzing technology, excessive essential factor analyzing, calculating the function of forecasting and also making the result of the decision visible. Based on so many advantages and also cooperates with the Internet technology, the Web GIS lays a foundation of making group decision into practical use.1: This program is based on many subjects such as agriculture, agrobiology, theory and method on systems engineering, metrology, operational research and so on. It relies mainly on Internet technology and information technology while practicing subsidiary. Based on analyzing agricultural product design, managing the procession of research and the mechanism of the group decision support system, this system which also combines methods and principles on computer software project carries out system development2: It collects data and then arranges and analyzes the data in order to find the relationship among society, economy and natural system. Afterwards it sets up data base and fixes agricultural production decision-marking system and decision-making criterion contento They're the foundation of decision support system. It carries out primary selection on systems analysis, forecastion and optimizing the design of related mould. It uses ASP (Active Serve Page) ,VB, VC, MapInfo, MapBasic and some other software to do system design.3: The support system changes every program into decision quota collection and puts the collection in the Data Serve. The support system (or use Maplnfo computer software) makes the district of decision numeralized.(according to the request of precision, it can simply uses the scanning map). It downloads Maplnfo picture automatically from the browser and makes use of OCX which is empoldered by Vb, Vc to finish the reforming of target specialized picture. Using OOP technology to achieve the separation of map and target data is much more easier and quicker than using Map Extrem made by Maplnfo company. This is the whole course of forming Web GIS.Then support system will make the map numerical for future use. This research makes the complicated Web GIS technology easier. Users can make use of User Interface to finish decision-making target project specialized picture. It can also helps policy-makers and agriculture producers to appraise and fix program scientifically so as to form the operating platform of making policy.4: The achievement of the policy is gained at the Server. It assists the policy-makers to finish the operation at the end of the browser.
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