根据洛惠渠灌区地质地貌，将整个灌区划分为三层阶地，通过对三层阶地上的地下水盐动态进行实时监测，运用双因子方差分析方法，详细论述了地下水电导率随地下水位在不同时期及不同分布条件下的变化情况。结果表明，地下水电导率变化与水位变化有很大关系，且表现出很强的区域特征：各阶地EC值均随水位的上升而增加，高EC值出现在高水位区，第一阶地高水位电导率存在显著变异。另外微地域环境、气候、生物、人类活动等外界因素也会影响地下水盐的动态过程。因此，有效降低该灌区地下水位是控制土壤盐化的重要措施，是实现农业可持续发展的关键所在。

The entire irrigation district is divided into three terraces based on the geology and geomorphology about Luohui Trench in this research, watersalt in soil dynamic behavior? on the three terraces is realtime monitored on the spot, and the paper detailedly analyzes the change situation of groundwater conductivity along with groundwater depth at different stages and in different distributed conditions using the method of double factor variance analysis. The results indicate that groundwater conductivity has close relation with water level, and this situation exhibits strong regional characteristics that the increase of EC value on each terrace is along with the rising of the water level, the high ?EC value always appears in the high water level district, and there exists significant variation of conductivity on the first terrace. In addition, the outside factors such as the microregion environment, the human activity, the climate etc., also can affect the dynamical process of groundwater and salt. Therefore, the reduction of the water level in this irrigation district is an important measure to control the soil salinification and it is a key to realize the agricultural sustainable development.