In order to scientifically manage grape being covered with soil to over winter, based on the ground temperature observation data of 10 vineyards at the eastern foot of the Helan Mountain in Ningxia in the winter of 2021/2022, the variation characteristics of daily mean ground temperature and the thermal diffusivity of 10-20 cm soil in different vineyards at the eastern foot of the Helan Mountain were analyzed. The results are show that in winter, the soil temperature decreased firstly and then increased, and soil temperature increased with the increase of depth. The temperature fluctuation of deep soil was smaller than that of surface soil, and the changing trend also lagged behind that of surface soil. The heat conduction method can well simulate the soil temperature of 10 cm and 20 cm in the eastern foot of the Helan Mountain in winter, and the effect of 20 cm soil temperature is the best, with the regression correction coefficient reaching 0.947 5. The soil thermal diffusivity (k) of vineyards in the eastern foot of the Helan Mountain in winter was generally higher. There were some differences of k value in each vineyard, the soil thermal diffusivities of Hedong Manor in Dawukou district at the north end of the producing region and St. Louis winery in Yongning county to the east were small, and the average k value was 6.11×10-6 and 4.53×10-6 m2·s-1, respectively. However, the thermal diffusivities in Guanlan Winery, Xige Winery, Legacy Peak Estate, Hennessy Winery near the Helan Mountain, D.F.Yuxing Winery and Pink Carrin Winery at the southern end of the producing region were larger, with average k values of 11.08×10-6 to 14.94×10-6 m2·s-1. The average k values of Emperial Horse and Meiyu Wineries were 9.63×10-6 and 8.52×10-6 m2·s-1, respectively.
