Damdusi was a kind of fermented soybean food added with ginger and sancho(Zanthoxylum schinifolium). To improve the preparing method of Damdusi, Asperillus oryzae was inoculated at steamed soybean and fermented at 25~3$0^{circ}C$ incubator far 48 hours. Salt, ginger and sancho was mixed into it after 1st fermentation, and the 2nd fermentation was also done at 30~37$^{circ}C$ for 1 week. After drying under the sun, sancho was removed from it. Dried Damdusi was composed of 4.90% of moisture, 35.07% of crude ash, 13.61% of crude fat and 23.44% of crude protein, respectively. Its flavor earned the high score(3.94) but taste did not (2.98) due to the salty taste by the sensory evaluation. Therefore, salt ratio was reduced to 18%, 16%, and 14% for improving the taste. The one with 14% salt concentration had the highest crude ash and crude fat but the lowest crude protein composition. The crude protein was the highest in the group of 16% salt. By the sensory evaluation, the taste and the overall acceptability was the highest in the 14% salt group.