Abstract: 【Objective】 This project aims to study the influence of water and heat conditions of different irrigation water on soil water and heat conditions under drip irrigation conditions so as to establish the mathematical model of water and heat transfer of surface drip irrigation according to the fundamental equations of water thermal motion of soil.【Method】Orthogonal experiments were conducted to design different drip irrigation water temperature levels and their combinations, 40 treatments in total. The mathematical model set with HYDRUS-1D software was applied to solve the numerical results, which were compared with the indoor measured data.【Result】The simulation equations of soil moisture content and pressure head of Xinjiang gray desert soil were established: (1) 公式; (2) e^l_n0.328 9Q－0.063 81.560 5 (h<0), Soil hydraulic parameters and thermal characteristic parameters were determined.【Conclusion】The soil water and thermal environment conditions for crop growth under the surface drip irrigation condition can be predicted with this mathematical model. In addition, both numerical simulation values and measured results indicate that low (10 ℃) and high (30 ℃) water temperature have great influences on soil surface under surface drip irrigation condition, and a certain increase of irrigation water temperature in early spring is beneficial to the growth of crops in the seedling stage.