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The grassland makes a significant contribution to the economy of Inner Mongolia. However, the grassland fire, which causes a great damage to the animal husbandry and threatens the properties securities of people in the pastoral area, is becoming an important interference factor to the steady development of grassland animal husbandry. The article, which combines the CHENEY grassland fire physical spread model, CA theory, local vegetation and climate together, introduced a grassland spread CA model fits for the grassland of Inner Mongolia. Choosing the MapX and VB as the secondary development softwares, the article realizes simulating the grassland fire spread trend dynamically on the basis of GIS system.