Optimal parameters of submerged fermentation for Antrodia camphorata were studied.According to the yield of Intracellular triter- pene,the optimal fermentation parameters were obtained as follows:40g/Lglucose,6 g/L soybean,1 g/L K₂HPO₄,0.5 g/L MgSO₄ and 100mg/L VB₁.The optimum cultural period was 6 d at 26℃in 250mL shake flasks at 100r/min.The best aeration ratio was 1:2.5(medi- um volume:flask volume).The inoculation volume was 20%.The intracellular triterpene of Antrodia camphorata was obtained(about 15.25mg/100mL) in the optimum culture.