In order to assess effects of chemical properties of soil salinity on electrical conductivity of 1:5 soil water extract (EC_1:5), the relations between EC_1:5 and chemical properties of soil salinity were studied through Path Coefficient analysis. The results obtained show that total soluble salt concentration (SSC), Cl^-, and sodium adsorption ratio (SAR) were the most primary factors to EC_1:5 of coastal sal-taffected soils, while pH, content of CO₃^2- or HCO₃^-, soluble sodium percentage (SSP) and sodium dianion ratio(SDR) affected EC_1:5 very faintly. Though direct path coefficients between content of SO₄^2-、Ca²⁺、Mg²⁺、K⁺ or Na⁺ and EC_1:5 were not high, they were enlarged by influence of other chemical factors, making the summation of indirect path coefficients between EC_1:5 and these factors relat ively higher. Verification showed that the multifactor regression function between EC_1:5 and most of the primary factors had sound reliability and very good accuracy, while errors in deducing electrical conductivities based on the function would somewhat be greater when soil salinity was excessively high.