Abstract: Based on three important parameters such as weight of hydrological zones (HZ), depth to water (DTW) and rate of rise(RR), a hydrological response units (HRU) map 2001 was created in the Tao’er River basin, Songnen plain, which can response sensitively to the spatial change of groundwater environment, and it is produced by the algebraic multiplication of the three classified grids: HRU = DTW*RR*HZ. The HRU mapping indicated that the risk degree is not high in the whole area, comparatively, the high risk zones are Momoge wetlands, Zhenlai county, Laifu and Chagan town, which attributed to the discharge alley of groundwater suffocated, the recharge of surface water body and irrational irrigation.

Key words: hydrological response units, soil salinization, groundwater environmental space, weight of hydrological zones, depth to water, rate of rise, Tao’er River basin