Abstract: By heating ultra-drying at 50℃, the moisture content of four species of vegetable seeds can reach the proper level of super-dry. The result indicated that except cowpea seed, which should be controlled between 2 to 4 days by heating ultra-drying at 50℃, the rest of vegetable seeds have quite strong resistance for high temperature and low moisture content. After the treatment, seed vigor is similar to control or even higher than control, without any harmful symptom. It proved that heating ultra-drying at 50℃ is safe and effective.