Applying the step-by-step correction model, according to the method of “light and temperature” step-by-step attenuation, the agricultural land grading crops in Hohhot City from 2010 to 2020 is calculated daily: corn, wheat, soybean thermal production potential, and their light-temperature potential is calculated. yield gap, that is, the difference between the actual unit yield of the leading producing county and the TPP of the corresponding meteorological site. The results show that the solar radiation in Hohhot had an upward trend in the past ten years, and the spatial variation trend is high in the west and low in the east. The TPP of its agricultural land grading crops has shown an upward trend in the past ten years. Regarding spatial distribution, the TPP of farmland is higher in the south and lower in the north, and the city generally shows an increasing trend. In the past ten years, the actual yield per unit of farmland in the eastern part of Hohhot has been relatively low, and the production difference between light and temperature has decreased from south to north and east to west. This study can provide a reference for the rational use of light and temperature resources in Hohhot in the future, guide agricultural production, cultivate land evaluation, give full play to the potential of light and temperature products in the region, and improve regional productivity.