Abstract: To explore the spatial variation characteristics and the impact factors of the soil hydraulic parameters for the saline-alkali soils in the western Jilin Province， we measured the soil-water characteristic curve(SWCC)， soil bulk density， salt content， moisture and mechanical composition in 0-20， 20-40， 40-60， 60-80， 80-100cm soil layers of saline-alkali and non- saline-alkali soil. The van Genuchten (VG) model was used to describe and solve parameters of SWCC. The results show that the VG model is suitable to describe the SWCC of the saline-alkali soils. There are significant differences of SWCC and K_○s between the saline-alkali and non- saline-alkali soils. For all the soils， the θ_○s and n show weak spatial variability， the θ_○r and α are moderate spatial variability， while the K_s of the spatial variability is strong for the saline-alkali soils (CV=109.09%) and has moderate spatial variability for non-saline-alkali soils (CV=51.09%). Soil mechanical composition， the soil salt content and pH value are the main impact factors for hydraulic parameters.

Key words: soil-water characteristic curve(SWCC), saturated hydraulic conductivity, saline-alkali soil, van Genuchten model, western Jilin Province