Based on the six land use maps from 1982to 2008of the Shanghuang watershed,the landscape metrics on landscape scale was calculated by using GIS and Fragstats 3.3software.And the characteristics of grain changes of these metrics were studied.The results showed that most of these landscape metrics have grain effects,and could be divided into 5different types according to their change characteristics with the increase of grain.The appropriate grain range of landscape metrics was 5~15mat the 1:10 000scale,and their grain effects were mainly controlled by the mapping scale rather than the change of land use