This study adopted an integrated approach of multitemporal remote sensing and multiscale spatial metric analysis to characterize the dynamics of urban expansion in the Jing-Jin-Tang urban agglomeration in the past 20 years (1990–2010). The results from three sets of Landsat imagery show that the BU area in this region has undergone a substantial increase, especially in the late 1990s to early 2000s. Although the three cities, Beijing, Tianjin, and Tangshan, each had a rapid expansion of BU areas, our results reveal their different development patterns. The NP, LPI, and LSI were used to understand the total urban growth patterns, and BD was used to analyze the development of different zones. BU land in Tianjin and Tangshan has been disaggregating with the increasing number of satellite towns in the suburban area, while those of Beijing, the capital city of China, have been aggregating to a more homogeneous urbanized region since the 2000s. Due to their suitability for human settlement and the government policies of economic development, the suburban counties located in plain areas and coastal districts of Tianjin maintain relatively high BU densities.