Abstract: The high amount of total salts is an important characteristic of the coastal saline soils, an impeding factor to the growth crops too. Electrical conductivity (EC) measurements are quick, simple determinations for water-soluble salts in soils. The standard EC method used a soil to water ratio of 1:5 and was measured in the supernatant at 25℃ . But the calculate method differed radically. In order to investigate the essential relationships between the total soil soluble salts (Y) and the soil electrical conductivity (X) in the coastal saline soil, this paper compared 10 types of curve regression equation. The results showed the best curve equation between the total soil soluble salts (Y) and the soil electrical conductivity (X) was linear equation in the coastal sandy saline soil: Y=0.045 2.935X(R2=1.000). But the R2 of the power curve equation was 0.998. The best curve equation between the total soil soluble salts (Y) and the soil electrical conductivity (Y) was the cubic curve equation in the coastal clayey saline soil: Y=0.194 3.096X-0.253X2 0.046X3 (R2=1.000). But the R2 of the power curve equation was 0.998.