The effect of different acidic water soaking seeds on rice seedling quality and yield was studied in 3 years the results showed that soaking seeds with pH from 3.5 to 4.0 acidic water raised rice germination percentage and seedling quality, shorten the hours of germination and cut down in cidence of seedling blight at the seedling staye.It was also shown that soaking seed with pH from 3.5 to 4.0 acidic water could increase 6~9% of yield.