Abstract:Abstract:By means of RS and GIS, the spatial and temporal distribution of forest patches in elevation, slope and slope direction was analyzed.The conclusions are as follows :(1) The total area of Saihanwula forest and the area of forest patches are affected by diseases, insect pests and location interference, and are reduced under different topographic conditions, especially in forest patches.(2) The patches of Saihanwula forest are mostly distributed in the sunny slope, and the large change of area is mainly reflected in the sunny slope, in which the large patches are reduced in any slope direction downward. (3) The slope has a negative correlation with the forest patches. With the increase of slope, the forest patches decrease. The changes of small and medium-sized patches are all related to the changes of patches in the previous level. (4) Nearly half of the forest patches were distributed on the 4th and 5th elevations,and they increase first and then decrease with the elevation. The small and medium-sized patches show different characteristics above and below the 5th elevations.