Based on the investigation of soil properties of coastal saline-alkali land with typical vegetations, including bare land, Suaeda salsa and Imperata cylindrica, the infiltration experiments were conducted with saline water of different salinity (0, 5, 10 g/L) to evaluate the effects of the typical vegetations on the characteristics of soil structure, saline water infiltration and soil water and salt distribution. The results showed that: 1) Soil bulk density and salinity were in the order of bare land > Suaeda salsa land> Imperata cylindrical land, while water stable macro-aggregates contents were on the contrary. 2) In the same plot, the initial infiltration rate, stable infiltration rate and cumulative infiltration increased with the increase of water salinity, while the above infiltration parameters of the saline water with the same salinity were in the order of bare land < Suaeda salsa land< Imperata cylindrical land. 3)Before infiltration, the salt contents in topsoil were in the order of bare land < Suaeda salsa land<Imperata cylindrical land; after infiltration, the salt content in topsoil of bare land increased with the increase of salinity, significant salt leaching effect was observed after saline water infiltered into the soil of Suaeda salsa, and the best leaching effect was obtained after salinity of 5 g/L salt water infiltration; while water salinity influenced salt leaching insensitively in the soil of Imperata cylindrica. 4) The results of two-factor ANOVA showed that the vegetation type had more influence on the infiltration characteristics than the water salinity.