Abstract: A kind of corrosion-resistant concrete in which fly ash and water-reducing agent were both added was developed to adapt to the special geological and hydrographic conditions in Northwest China saline soil area. A lab test was performed to investigate the properties of the concrete, such as corrosion resistance, impermeability, carbonization resistance and freeze-thaw resistance, and a field test was done in the saline soil area for the concrete's impermeability and corrosion resistance. The relationships between the amount of fly ash additive and durability indices of such resistances were found. The results showed that adding fly ash and water-reducing agent in the concrete can improve its performance to resist sulphate corrosion and permeation, but fly ash has adverse effect on carbonization resistance. And the existing two-additive compound formulation lowers the freeze-thaw resistance. By a comprehensive analysis, the compound formulation that the fly ash amount is 40% in both additives is recommended for the concrete to be used in the saline soil area, which is available to provide higher durability indices of all resistances as above.