Abstract: Since the Kunming municipal government's relocation planning in 2003, significant changes have occurred in land use within the built-up area of Chenggong under policy-driven influences. To better explore the land use changes in the study area, this research systematically analyzed the spatiotemporal evolution characteristics of land use using methods such as multi-scale segmentation, transfer matrix, dynamic degree analysis, and standard deviational ellipse, based on three phases of satellite imagery data with 0.54m resolution from 2004, 2014, and 2024. The results indicate that: (1) From 2004 to 2024, impervious surfaces and tree canopy coverage increased by a net 685.19 hm² and 1 340.3 hm² respectively, while cultivated land and bare land decreased by 1 299.53 hm² and 919.99 hm²; transfer matrix analysis shows significant two-way conversion between impervious surfaces and tree canopy coverage, with cultivated land and bare land mainly converted into construction land and tree canopy coverage. (2) Dynamic degree analysis reveals that the growth rate of impervious surfaces has slowed down, ecological land has improved significantly, but the loss of cultivated land has intensified; the comprehensive land use dynamic degree from 2014 to 2024 indicates an increase in the intensity of human activities' interference with land. (3) In terms of spatial pattern, the distribution of impervious surfaces has shifted from discrete to balanced, with the center of gravity showing a significant shift toward the southeast; tree canopy coverage exhibits a "discrete-balanced-discrete" characteristic, and its center of gravity has shifted toward the northwest, reflecting an urban spatial development model of "southeast development and northwest restoration." In summary, the built-up area of Chenggong shows the characteristics of "urban expansion dominance and ecological synergy optimization." The sharp decline in arable land still requires attention, and the research results can provide a scientific basis for the sustainable development of the city.