| Derivation soil hydrodynamic parameter and numerical simulation of soil water movement and distribution are important parts of soil water movement research.. In this paper, soil water movement law about cotton field drip irrigation is summarized by experiments and numerical simulation study based on many experiments and mathematical model about drip irrigation in domestic and abroad. Actual instrumentation data is used for verification character of soil water movement about drip irrigation; it is a effective way to definite water-saving irrigation system and increasing water use efficiency with drip irrigation for cotton field in arid region.Analysis and summary is based on the experimental results, a series of law about soil water movement and distribution can be gotten; discus the effect possibility is acted by dripper discharge, irrigation quantity, fertilizer solution concentration. the results showed that the level of dripper discharge have obvious effect on shape of wetting soil, fertilizer solution concentration has little on water movement. Determine the suitable irrigation for research region system is little dripper discharge and high frequency irrigation. RETC software is used to deduce the soil hydrodynamic parameters based on composition of soil Particles and bulk density. HYDRUS software is used to simulate the soil water movement under drip irrigation in different drip discharge levels which is validated by direct method, and predict the development of shape of wetting soil. the results showed that relative error of calculation from the tested results is less and the math model can be used in numerical simulation study for cotton field drip irrigation.
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