Abstract: Landscape change is a complex dynamic process of mutual interference and interaction between human socio-economic activities and regional environment. With the development of economy and society and the continuous enhancement of human activities, the evolution of natural ecological environment is becoming more and more intense. This study analyzes and evaluates the temporal and spatial characteristics of landscape pattern in Chengdu and the impact of landscape pattern change on ecological environment quality, in order to promote the harmony between man and nature, maintain the stability of urban ecosystem, optimize land spatial pattern and provide scientific basis for park city construction. Based on the historical remote sensing data of Chengdu from 2000 to 2020, using remote sensing, GIS technology and FRAGSTATS software, this paper systematically analyzes the land use / cover types in the study area, and quantitatively studies the changes of landscape pattern and its ecological effects in Chengdu. （1） In the past 20 years, the land use structure of Chengdu has changed significantly. The land use pattern dominated by agricultural land has gradually changed to the situation dominated by cultivated land, forest land and man-made surface, accounting for about 94.71% of the total area of the study area, becoming the leading land use / surface cover type of Chengdu. And, man-made surface has the fastest growth rate, with a single dynamic degree of 44.58%, followed by water and forest land; The slowest growth rate is grassland and wetland. （2） In the past 20 years, the spatial change area of land use in Chengdu has reached 237303.17hm², accounting for 16.56% of the total area of the study area, showing the characteristics of a large number of transfer out of cultivated land, grassland and forest land and a large number of transfer in of man-made surface and forest land. （3） The landscape type of the study area is mainly cultivated land, and the man-made surface landscape type is the landscape type with the greatest change in the past 20 years, forming a large agglomeration patch and expanding year by year. The degree of human disturbance to the overall landscape pattern has increased year by year, the diversity and heterogeneity of landscape have increased, the dominant landscape has weakened, and the landscape components tend to develop more evenly. In the future, with the transformation of economic and industrial structure, the enhancement of ecological and environmental protection awareness and the construction of Park City, the influence of human factors on landscape pattern will gradually increase in a short time scale.