Abstract: Studies on the main characteristics of ecological environmental change and human activity in Qinghai lake region show that the destruction of ecological environment is caused by the uplift of the plateau and the human activity. Climatic change is the dominant factor in the ecological environmental change,and human activity is the catalytic and inducing one. The effect of human activity on the ecological environment should not be ignored in the region.

Key words: road network, forest landscape, pattern, Great Xing’an Mountains, principal component analysis (PCA).