In analyzing landscape heterogeneity in a typical area, appropriate selection of characteristic scale is very important. In this paper, Gongyi City, located in mountainous and hilly area of western Henan Province, has been chosen as our study area. Based on 3S technology, the landscape composition and structure of this area are analyzed. Meanwhile, the characteristic scale of landscape heterogeneity is determined by using the semi鄄variable function and moving window method. According to the characteristic scale, we selected two sample lines, which extend from the direction of NW to SE and the direction of NE to SW. These two sampled lines are set to analyze the spatial characteristics of landscape heterogeneity under different disturbances. Finally, the results show that landscape of the study area mainly consists of dry land, construction land, irrigated land, grassland and woodland. Among these landscape types, the dry lands have the largest proportion, accounting for 30. 9% of the whole area, while the irrigation canals have the least area proportion, accounting for 0. 1% of the whole area. Based on the semi鄄variable function and the moving window method, the characteristic scale for analyzing landscape heterogeneity of the study area is 1000 m. Under this characteristic scale, the landscape fragmentation of the study area is mainly concentrated in the valley plain and hilly regions of the southeastern part

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