[Objective] The ecological risk level and its temporal and spatial evolution processes based on the change in the landscape pattern in Yongchuan District

Chongqing City were analyzed to provide a scientific and theoretical basis for the optimization of land structure and ecological spatial development.[Methods] Taking an administrative village as the study area

the inflection-point method was used to determine the suitable spatial grain. Subsequently

the landscape pattern index was incorporated to develop an ecological risk index. Furthermore

spatial autocorrelation and "hot spot" analysis were used to study the temporal and spatial evolution of the landscape ecological risk in Yongchuan District.[Results] ① The suitable spatial grain of the landscape pattern analysis in Yongchuan District was 60 m. ② During the study period

the ecological security situation of Yongchuan District improved. The low-level risk areas extended southeast and southwest around Chashanzhuhai Street

and the high-level risk areas expanded outward around Wujian and Baofeng Town. ③ The Moran's I values of the spatial distribution of ecological risk were 0.447 2

0.444 6 and 0.372 2

which indicated the clustering of research units with similar ecological risk. The high-high aggregation defined as the hot spots was distributed in the form of clusters in the northwest

southwest

and south of Yongchuan District and had expanded. The low-low aggregation defined as the "cold spots" extended southeast with Chashanzhuhai Street in bands.[Conclusion] Although the ecological security situation in Yongchuan District was improving

the ecological risk of towns near the urban perimeters and administrative boundaries has fluctuated greatly. Thus

these areas should receive more attention in future ecological governance.