Urbanization has substantially reduced forest landscape connectivity worldwide, which affected some critical ecological processes in forest ecosystems. The urbanization effects on forest landscape connectivity were assessed from 1990 to 2006 in the Eastern Shandnng Peninsula, China. The layers of urbanization factors （ city area and road） and forest landscape were obtained from TM images and historical data. The probability of connectivity （PC） and the importance of an existing node for maintaining landscape connectivity （ dPG）, based on the graph theoretical method, was used to quantify the changes in forest landscape connectivity. City area and road building were used as the forcing factor to analyze the urbanization effect on the forest landscape connectivity quantitatively. The results showed that the development of city and road has greatly decreased the forest landscape connectivity in city level. Subsequently, the reduction of connectivity h~ greatly influenced the ecological processes of medium movement ability. The results also showed that urbanization factors have affected forest landscape connectivity more significantly than forest area. Therefore, the probability of connectivity can be properly used to monitor and evaluate the urbanization effect on the forest landscape and the ecological process.
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