Using Landsat remote sensing images in 1990, 2000, 2010 and 2019, land use types in the dry-hot valley area of Jinsha River Basin are classified by combining visual interpretation with maximum likelihood, and the spatiotemporal change and transfer process of land use types in the dry-hot valley area of Jinsha River Basin are also studied. The InVEST model combining meteorological, soil and topographic data are used to evaluate the water-producing and water-conserving function of different land use types in the dry-hot valley area of Jinsha River Basin from 1990 to 2019. The main conclusions are as follows:(1) from 1990 to 2019, grassland, forestland and cultivated land were the main types of land use in the dry-hot valley area of Jinsha River Basin. In the past 30 years, the area of shrubland, construction land, transportation land and water area has been increasing continuously and the area of grassland, forestland, cultivated land and bareland has been decreased. (2) The area increase in construction land, shrubland, transportation land and water area came from grassland, farmland and forestland from 1990 to 2019. (3) In the dry-hot valley area of Jinsha River Basin, the annual average water yield was 26.09×10⁸ m³, the water conservation amount was 7.26×10⁸ m³, and the average water conservation capacity was 68.74 mm showing a fluctuation of up-down-up. (4) From 1990 to 2019, the water conservation amount of different land use types changed significantly, and the average water conservation amount of different land types was from large to small:farmland > grassland > construction land > forestland > transportation land > shrubland > bareland > water area.