The emergence of blowouts in grassland areas has accelerated the process of desertification of grasslands and posed a serious threat to the balance of grassland ecosystems. The studies on blowouts in sandy grassland mainly focused on the morphology, scale and mechanism of the current blowouts, and there is a lack of studies focusing on the morphological changes of blowouts in a complete development cycle at the regional scale. Based on this, this study took the blowout in Dahekou Town, Xilingol sandy grassland area as the research object, and used the U.S. Keyhole satellite data and China's Gaofen-1 satellite data as the data source. ENVI 5.6 image data processing software and ArcGIS 10.5 data extraction and analysis software were used to extract blowout morphology data for a total of six periods from 1962 to 2023, and regional scale long time series blowout morphology change analysis was carried out. At the same time, the stand-alone and composite blowouts, which are typical of the sandy grassland development in Xilingol, were selected, and the morphological evolution process of the blowouts in the past 60 years was explored by using the landscape pattern index method and the elliptical geometric parameter quantitative description method. It was found that the coefficient of variation of blowout patch area(AREA_CV), mean patch shape index(SHAPE_MN), and mean fractal dimension index(FRAC_MN) increased significantly from 1962-2023, and large blowouts developed in the study area during this time period. The general development pattern of blowouts was that the pit body extended to the back edge of the pit, the sand deposition body extended along the prevailing wind direction, and the morphology ranged from ovoid to saucer-shaped to trough-shaped pits. The area and length of the long and short axes of the typical stand-alone and composite blowouts developed in this area showed fluctuating trends over time, and the length of the long and short axes of the composite blowout A increased by 722.78% and 150.43%, respectively, and the evolution process went through the three phases of bare ground sand patches, active development, and stationary demise, and this type of blowout had the possibility of reactivation in all of the three phases mentioned above. Through the research on the morphological evolution of blowouts in Xilingol sandy grassland, the results can provide a theoretical basis and data support for the management of grassland blowouts and the prevention and control of grassland sanding, and the sustainable use of grassland resources.