'Sunjung', a new variety of oyster mushroom was bred in Mushroom ResearchInstitute, Gyeonggido Agricultural Research & Extension Services in 2006. This oyster mushroom was bred and cultivated one after mating with monokaryon collected from KME20064 and KME20066. The optimum temperature for the mycelial growth was about 26∼28 and that for the primordia and growth of fruitbody was about 18∼23℃. Compared to the control which took 25 days of incubation period, Sunjung required 21∼ 22days. It grew primordia after developed a lump of mycelium. In the characteristics of fruit body, pileus was infundibuliform of yellow-color and stripe was slender/long shape of white color. The yield was 112.9g/850cc bottle and 275.5g/2kg P.P bag.