New onion cultivar ‘Sinseonhwang’ with mild taste and shipping quality was developed by the Allium vegetable cropbreeding team of the Bioenergy Crop Research Center, NICS, RDA in 2006. The ‘Sinseonhwang’ was selected from‘Paechonghwang’ population, an early maturation cultivar. Line selection was conducted from 1995 to 2001. As a mild tastecultivar, it has lower pyruvic acid concent of 2.16 μmol/g F.W and a bolting percentage of 6.0% whereas the check cultivar‘Marusino 330’ contains 2.60 μmol/g F.W of pyruvic acid and 19.9%, of bolting respectively. The bulb has dark yellow skincolor, globe shape and large size type. Lodging date of this cultivar was April 30 which was similar to check cultivar. It ismoderately resistance to downy mildew and soft rot compared to check cultivar. The fresh weight of bulb was 254g and theaverage yield was 6,176kg/10a in ordinary culture of local adaptability test. ‘Sinseonhwang’ will be highly adaptable to the southarea in Korea.