Abstract: In order to study the ground temperature change and soil heat storage effect of solar soil warming system applied in cold areas, A two-dimensional physical model of soil heat storage with horizontal buried pipes was established by using ICEM.Based on the experimental conditions, the unsteady heat transfer between horizontal buried pipe and soil was numerically simulated by using FLUENT.Combined with experimental data and numerical simulation, the results show that the heat accumulated in the soil during the day could keep the lowest soil temperature from night to the next day before the operation of the system, which was 13.09℃ at the depth of 10 cm, 15.3℃ at the depth of 15 cm and above 16℃ at 30～60 cm depth, thus avoiding the inhibition of the growth of warm-loving vegetable tomatoes caused by low soil temperature. Solar soil warming system has a certain heating effect on soil in solar greenhouse, and should be popularized and applied in its applicable scope.