According to the characteristics of coastal saline soil in Jiangsu Province, the changes of soil salt index were analyzed under the field experiments with five soil amendments. The best amendment to the coastal soil in study area was selected according to crop output. The results showed that soil salt content, pH, total alkalify and sodium adsorption ratio (SAR) decreased under the treatments of Hekang, Kangdibao and humic acid compared with CK, especially under the treatment of humic acid, the amounts decreased by 0.53 g/kg, 0.16, 0.170 cmol/kg and 2.61, respectively. Under the treatment of gypsum, soil salt content increased by 0.16 g/kg. However, compared with CK, pH, total alkalify and sodium adsorption ratio decreased by 0.08, 0.09 cmol/kg and 3.33, respectively. There were no significant differences under the treatment of Jinmantian biological bacterium agent. The application of the amendments could increase crop yield compared with CK, especially when humic acid was used, the yields of rape and corn increased by 15.68% and 9.15% respectively.