In order to explore the influence of topographic factors on the development of erosion gully

re-grading Digital Elevation Model（DEM） at different levels was conducted in the study area. The erosion gully distribution data were obtained from the results of the Erosion Gully Census in the First National Water Resources Census (2010) and the results of the Erosion Gully Census in the Fifth Soil Erosion Census In Liaoning Province (2015). Erosion gully elevation

slope

slope aspect

slope length and space differentiation were based on the 1:50 000 DEM . This study analyzed the characteristics of erosion gully development and topographic differentiation in Liaoning province of China with the supported of geographic information system (GIS) and remote sensing (RS) technology. The results showed that the erosion gully density increased 0.02 km/km2 in the study area within 5 years

and the erosion gully mainly concentrated in the western Liaoning. The change value of the erosion gully density were less than 50 m/km2 in more than 70% of the study area

most of them were in the micro enhancement zone. The change value of density was maximum when the elevation was between 325 m and 350 m. The change values of density of the south slope and southwest slope were the maximum. When the slope was between 1.5o and 15o

the graph of change density was parabolic

and there was no obvious change when the slope was less than1.5o and more than 15o. The density change was the maximum when the slope length was between 600 m and 800 m

and there was no significant difference in density change when the slope length was more than 1 000 m.