Experiments were conducted to determine the effect of diluted sea water on the germination, growth and yield of green soybeans. The germination rate was not significantly different at 0 to 3, 000ppm Cl 2 days after starting the germination test. Seedlings were grown in sand culture for 20 days after seeding. The top dry weight was greatest at 250 and 500ppm Cl. Green soybeans were grown in sand and soil cultures. Salt injury in sand culture was not found at 0 and 100ppm Cl. However, it was slight at 250ppm Cl, and became much more severe with increasing sea water concentrations. The seed fresh weight was greatest at 0 to 250ppm Cl in sand culture and at 0 to 500ppm Cl in soil culture. There was an increase in Na and Cl content in the leaves in sand and soil cultures when sea water concentrations were at high Cl levels. The content of Cl and exchangeable Na, and EC value of the soil increased with increasing sea water concentrations.