The dynamics of soil salt content and its affecting factors in platform fields in Yangkou port of Jiangsu Province were investigated from June in 2006 to May in 2007. Results showed that soil pH of the tested plot was higher than 8.0 at 0-50 cm depth. The soil salt content increased with the soil depth, and the annual mean soil salt contents were 2.30, 2.84, 4.76, 6.19 and 8.60 g/kg at 0-10 10-20, 20-30, 30-40 and 40-50 cm depths respectively. Meanwhile, the soil salt content decreased with the time. The dynamics of monthly mean soil salt content indicated that soil salt content was increased from February to June, and reduced from July to September. According to the correlations of soil salt content and other soil physical and chemical properties, soil bulk density and soil mechanical composition play important roles in the dynamics of soil salt content in platform fields in Yangkou port of Jiangsu Province.