【Objective】Salinization leads to a decline in soil fertility and reduced agricultural productivity, significantly limiting the high-quality development of arid region agriculture. Bioorganic materials have shown promising effectiveness in land reclamation for salt-alkali-affected areas. 【Method】The effects of adding different biomass materials (8‰ biochar (B), 8‰ biochemical fulvic acid (BF), and a mixture of 4‰ biochar and 4‰ biochemical fulvic acid (BBF)) on the physicochemical properties and water-salt transport characteristics of soda saline-alkali soil was investigated, through one-dimensional vertical infiltration experiments. Each layer of soil was completely mixed with bioorganic materials and subjected to an equal volume treatment. 【Result】The results showed that the application of biochar and biochemical fulvic acid both significantly reduced soil bulk density and increased porosity, with significant differences between treatment B and other treatments (P<0.05). Under the same infiltration time,the wetting front depth of B, BF, and BBF treatments was significantly smaller than that of the CK, with the BF treatment showing the smallest wet front migration depth. Both the Kostiakov and Philip models could effectively simulate the infiltration process, and the infiltration rate (S) showed a variation pattern of CK > B > BBF > BF. The B, BF, and BBF treatments significantly increased the soil volumetric water content in the 0-15 cm soil layer, with significant differences among the treatments (P<0.05). At the 15 cm soil depth, the soil salt content in the B, BF, and BBF treatments was higher than that in the CK, and the soil salt content in the 20-30 cm soil layer gradually increased with depth. The BF treatment showed the most significant effect on salt content. Also, the soil pH in all treatments was lower than the initial pH, but in the 0-15 cm soil layer, the pH of the B, BF, and BBF treatments was higher than that of the CK. Additionally, the concentration of soil salt ions in the 0-15 cm soil layer was higher compared to CK, especially the water-soluble Na+ concentration, which significantly increased. 【Conclusion】The result indicates that bioorganic materials, such as B and BF, exhibit significant effects in land reclamation for salt-alkali affected areas by significantly reducing soil bulk density and increasing porosity. Additionally, these materials decreased infiltration rates while enhancing cumulative infiltration, though increased Na? concentrations may affect long-term outcomes. Therefore, when improving salt-alkali soils, emphasis should be placed on considering the physical properties of bioorganic materials. It is recommended to select materials with suitable physical properties and low sodium content, followed by salt leaching treatments, to optimize land reclamation efforts.