Through field GPS surveying and dealing with the data that got from field,the relationships between gully length and road length as well as the characteristics of gullies in different buffers with different radius of road in Hebei small watershed of Northestern China were analyzed.The following conclusions were acquired:(1)the quantitative relation suggested a relationship between road length and gully length existed,especially in valley and the lower slope,unpaved road and gully length had a strong relationship.(2)Gully distribution was closely related with road distribution.The buffer of road with the range of 25 meters was the mostrisky area where gully easily happened,so road was an important factor for affecting gully happening