Abstract: The paper mainly analyses the distribution and change of reed resources in the lower reaches of the Huihe River in Hulun Buir grassland of China on the basis of remote sensing information and specimen spot data. In order to preserve and use effectively reed resources, a proposal is also put forward. 1) Though the area belongs to semi-dry grassland zone, the climate is not suitable to reed growing, which need a lot of water, there are many wetlands caused by the winding course of swamp stream on the smooth grasslands (gradient is about 1:2500), they provide fine natural conditions for reed growing, so that in the wetlands the reed comnunity covers an area of more than 300 km². 2) The moisture difference, caused by the geomorphologic difference results in the difference of reed growth. The reed there can be divided into three degrees according to the qualitative features (height, major diameter, density), grantiative feature (weight per unit) and remote sensing images (colour, tone, etc.). 3) Compared with the historical data it is shown that the reed in the area has been already degenerated. The major reasons are climatic changes and improper utilization. In order to preserve and use the read resources most properly, it is necessary to build irrigation works and improve production management.