The spatial-temporal characteristics of vegetation cover in the Circum-Bohai Sea Region from 1999 to 2009 were studied based on annual NDVI data and semi-variogram. Main conclusions are as follows. 1) The vegetation cover of Liaoning exhibited the highest continuity, while the fragmentization of the vegetation cover in Shandong Province was outstanding; impacts of terrain on the spatial distribution of vegetation cover were stronger than those of climate factors in Liaoning Province, while in Shandong Province and the Beijing-Tianjin-Hebei region, impacts of temperature were stronger than those of moisture; 2) Structural factors are dominating factors that impact on spatial patterns of vegetation cover in Liaoning Province, Shandong Province and Beijing-Tianjin-Hebei region, however, their impacts showed a weakening trend; 3) Directions in which the spatial patterns of vegetation cover were most continuous in Liaoning province, Shandong province and Beijing-Tianjin-Hebei region were northeast-southwest (30°), northwest-southeast (150°) and northwest-southeast (135°)， respectively， indicating the variability of impact factors' distribution and their roles in influencing the spatial patterns of vegetation cover.
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