Urban expansion pattern and driving mechanisms in Kuala Lumpur was analyzed by using long time sequence and high resolution Landsat TM images.After the influence factors and limiting factors were confirmed,simulation and prediction of urban expansion for the study area were made based on the CA model theory.Results show that urban expansion in Kuala Lumpur is in a high speed period and is supported by the multi-economic centers.The filling expansion pattern in Kuala Lumpur inner city is greatly affected by centralized expansion pattern around Kuala Lumpur.Urban expansion is mainly toward northwest,south,and southeast for the influences of terrain,economy,and government policies.Urban expansion to the south is most obvious.