| With the international economy, development of the society and science and technology, geoscience research field pay attention to ecological environment, natural calamity, climatic change, origin of life, people and natural research of relation of evolving etc more and more. The population, resource, environment are regarded as the important issues of the human society and economic sustainable development, front subject that has already learnt to be studied becoming. Nowadays among them desertificate and is regarded as the most serious environment in the world and social economic problem, people's extensive concern of the quilt. Remote sensing observes technology and already becomes land and desertificates the important means to study at present right as one kind. No matter the origin cause of formation is analysed, or desertificate and prevent and cure, it is very important that to understand the evolvement law, also be a very important issue to study desertificate and manage.With the further development of technology of the computer and picture treatment technology, have desertificated and managed the technological means to study and has been developed on a large scale very much, it stresses the trend reflects mainly the combination in technology, technology of the remote sensing technology (RS), the geographical information system (G1S), the global positioning system (GPS) and so on. Utilize remote sensing information can get continuous time oasis, desert in the array and interlock desertification land of area utilize information of changing, develop for desertification, time of array analysis of law offer datum support.Research this under 3S technical support, take Hongyuan county of Aba state of Sichuan as the studying area, solve and translate and draw land degradating, desertified information from remote sensing image, combine the existing land and utilize picture information of the current situation and other statistical data, make to land degradate, desertification, etc, land desertificated phenomenon, county of Hongyuan, development law, time of array analyse and research, main research contents and result include the following several respects:(1) Have set up land desertificated space database. Regard Windows 2000 Professional as operating system, adopt geographical information system products 8 of ARC/INFO, ESRI of Company, Arc View is the workbench, having set up the desertificated space database of land of Hongyuan county, including the land utilizes the current situation, investigating some in the field,remote sensing image solves and translates such space information as the result, etc.(2) The data processing of remote sensing, strengthen the treatment method and carry on research to the digital picture, strengthen dealing with to the research institute with the remote sensing data on this basis. Use remote sensing deal with software set up model of correcting, to area studied to want make radiation correct and go cloud not to punish, have received better correcting the result.(3) Have carried on the image classification of remote sensing, pointed and solicitted after drawing the desertification. Have got ten kinds of main land use pattern grouped datas of different time slots of Hongyuan county, combining the field investigation situation, the categorised precision meets the demand of analysing basically. Studies have shown that there is the amount of kind more than ten in the land use pattern within the territory of Hongyuan county, such ten kinds of land types as the marshland, sand ground, inferior alpine meadow of grassy marshland, etc. among them, accounts for 92.54% of the whole area in Hongyuan county, sand ground centre in this county's north township named Waqie mainly.(4) Comprehensive remote sensing data and plural information material is to study district different land desertification of period carry on dynamic analysis, get this area the past 30 years land overall trend that desertification evolve and land utilize variation tendency the past 20 years. Is it find Hongyuan land degradate, desertification go through one soon slacken the course to analyse, have formed it from the marsh - the grassy marshland - the grassland - the overall trend desertificated and developed, among them, the obvious desertified area is by 15 in 1974. 56km2" increases by 54 by 2002. 83 km~2. The increasing degree is larger. Land in the past 20 years in changing, marshland and high and cold marsh grassy marshland meadow run off in a large amount, the area of the corresponding inferior alpine meadow of grassy marshland and high and cold meadow of grassy marshland is increasing constantly, other land types have trend of degradating in various degree. Its reason of the fault, ground climatic change and human factor of the office are causing land degradating, desertified immediate cause in Hongyuan county, the average annual temperature increased by 0.4℃ in the past 23 years, the average annual water falling reduced close to 100mm, people for a large amount of cultivation, overgrazing is another main reason which made Hongyuan county's land degradating, desertified. Finally, on the basis of analyse development characteristic happens in the land desertification of studying areaing, propose it in order to close controlling, protect preventing and curing, limit such concrete prevention and cure measure and...
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