| Intensifying the development and utilization of slight saline water, especially how to make rational use of brackish water, will greatly alleviate the shortage of fresh water resources of China's situation. It improves the integrated use efficiency of water and soil resources , and ensures the safety of water and land resources for sustainable use.Taking Hongwei irrigation test station of Hetao irrigation district as target, the paper probes into Saline Water Irrigation Modes in Hetao Irrigation Area.Applying Geo-statistics theory as research tool, based on the SWAP model to simulate water, solute and heat in the soil - atmosphere - crop environment migration process. Through the field experiment, this paper carries on studying soil water and salt migration laws and impact on crop growth and physiology. And in the same time,according to the basic principles of Geo-statistics, analysis of three-dimensional Ordinary Kriging using GS + software, the study area is divided into three parts to obtain the conclusion of the spatial variability of partition by regional soil water and salt information.Based on the structural partition of soil water and salt, we introduce SWAP model. SWAP was calibrated using observed data. Then we construct one-dimensional vertical unsaturated water and salt transport model system, considering the regional variability discretization by the Simultaneous solution of each regional SWAP model.In conclusion of numerical simulation of brackish water irrigation modes ,based on SWAP model system, we found irrigation scheme of Fresh water-salt water-salt water that is the smallest for regional environmental impact of soil in all the options.This brackish water irrigation mode could guide local irrigation, and have a certain reference to improve the usage of this kind of water, it also can provide theoretical support for the sustainable development of agriculture in Hetao Irrigation District.
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