Abstract: Under the background of the "double carbon" goal and sustainable development, this paper discussed the changes of land use pattern and the response of the ecological environment in Yibin city, the first city of the Yangtze River, since the implementation of ecological projects such as returning farmland to forests and protecting natural resources of natural forests, so as to provide an important scientific basis for the regional land spatial planning and ecological environment managemtn. Based on the remote sensing image data of 2000, 2010 and 2020, the land use change and its ecological environment effect in Yibin from the aspects of land use dynamics, ecological environment quality and ecosystem service value were comprehensively analyzed. The results showed that: (1) Since 2000, the land use change in Yibin city was mainly manifested as the decrease of grassland and cultivated land area, the fluctuation of woodland area, and the area of construction land and water body increased. Construction land and water bodies had the largest dynamic change with a positive direction. (2) During the past 20 years, the value of ecosystem services increased from 33.321 billion yuan to 34.782 billion yuan, an increase of 1.461 billion yuan. (3) In 2000, 2010 and 2020, the ecological environment quality index was 0.4065, 0.4077 and 0.4078 respectively. The eco-environmental quality of the study area showed an upward trend while maintaining a relative balance, but both improvement and deterioration coexisted in this region. There is a long way to go to build the first ecological city of the Yangtze River in Yibin. In the future, The ecological restoration work in Minjiang River and Xiangjiaba reservoir area should continue to be solidly promoted, with emphasis on improving the service capacity of regional ecosystems, so as to effectively take the road of ecological and low-carbon development in Yibin.