The research used the mixture of mushroom cultivation,saw powder,novogro and desulfurizated gypsun as soil conditioner to improve the soil property of the coastal dredge fill during mixing and leaching process.Base on it,feasibility of soil conditioner was verified and the better application rate was chosen.The results showed that soil conditioner had positive effect on soil physical properties,which soil bulk density was declined,soil infiltration and porosity were increased with the application of the soil conditioner.The desalination rate in the treatment group was much higher than that in the control group,although the total removal of soil salinity was not increased.The water consumption in the treatment group accounted for 69.23% of that in the control group.Soil Cl- and HCO-3 were the major ions which were removed in the desalination.The soil nutrient was promoted and the toxic effect of soil salinity on plants was alleviated with soil conditioner.Biomass increased with the increasing of the application rate of soil conditioner.It was concluded that the best application rate of soil conditioner was 15% after comprehensive consideration.