Remediated soils (RS) are generally used for various constructional sub-materials. However, the RS might be utilized for agricultural purposes such as soil improvement agent if the physical and chemical properties of the RS soils that improved by specific remediation methods, for example landfarming method. Therefore, this study was conducted to investigate the effects of RS soil application on the different properties of soils as comparing with the influences of gypsum (GP), organic compost (OC), and mixed treatments on the various soils. The soils used in this experiments were acidic soils in orchard (ASO), soils in newly reclaimed land (SNR), upland soils in reclaimed land (USR), and soils in reed-beds (SRB). The 1600 g of soil samples were weighed and transferred to 2000 mL polypropylene bottles. The RS, GP, OC, and mixed materials were applied (amount of the materials weighed on dry-weight basis) to the different soils as soil improvement agents: RS was treated as 1, 2.5, 5, and 10% of total soil weight (TSW), GP and OC were applied as 1 and 2.5%, respectively. In addition, the mixed materials were added as 1% (0.5+0.5%) and 2.5% (1.25+1.25%) of the mixed agents combined as RS+OC, GP+OC, and GP+RS, respectively. Mixtures of the different soils and improvement agents were incubated for 2, 4 and 12 weeks at 70% of field capacity moisture and at room temperature (24±2℃). In the RS soils including SNU, USR, and SRB soils, electrical conductivity (EC) and Na concentration decreased with the GR treatments even though soil pH did not changed. With the application of mixed agent, RS+OC, the concent of soil organic matter (SOM) and available phosphate concentration declined and also exchangeable sodium percentage (ESP) decreased depending on the decrease of Na concentration. In particular, with the treatments of GP+OC and GP+RS, soil pH decreased but EC value increased because of the chemical properties, Ca2+ and SO42-, of GP. with this reason, the Ca concentration also markedly increased with the GP treatment. Furthermore, the Na concentration exchanged with Ca ion from the soils also increased because Na ion was not leached in the experimental pots. Thus, GP application can not work as a soil improvement agent in the poorly drained sodic soils. On the other hand, in the ASO soils, soil pH and available phosphate concentration decreased with the GP application, but EC value, SOM content, and Ca concentration increased. However, with the RS addition, soil pH, SOM content, and Ca concentration increased, but available phosphate concentration decreased. In the ASO soil with the OC application, soil pH, EC value, SOM content, available phosphate concentration, and Ca concentration increased, but then the available phosphate concentration decreased at the level of control soil after incubating 12 weeks. In the soils with the RS+OC mixed treatment, soil pH, SOM content, and Ca concentration increased, and EC value, SOM content, and Ca concentration increased with the applications of GP+OC and GP+RS.