给出了计算不饱和土壤中热、水、气运动的二维数学模型，并对无作物覆盖情况下土壤中热、水、气运动进行了数值模拟，得到了一定环境条件下土壤床内各场量的分布，为进一步分析农作物理想的热力与生态环境奠定基础． The two-dimensional mathematical model for calculating the movement of heat, water and gas in unsaturated soils is given. The numerical simulation of the movement of heat, water and gas in the soil without crop coverage is given. The distribution of field quantity lays the foundation for further analysis of the ideal thermal and ecological environment of crops.