Abstract: The mycelium growth speed and the decomposition ability to starch of Cordyceps sinensis,Ganoderma lucidum HG and Ganoderma applanatumuan were compared on the flat medium.It was found that their mycelium growth speed reached 1.28 cm/d,0.64 cm/d,0.55 cm/d respectively,and the utilization ability to the starch Ganoderma lucidum and Ganoderma applanatumuan were superior to Cordyceps sinensis.The mixed culture results showed the optimum inoculation age of Cordyceps sinensis to Ganoderma lucidum HG was 3 d to 5 d,also the optimum inoculation proportion of Cordyceps sinensis to Ganoderma lucidum HG was 2:3;The best fermentation medium was tested by orthogonal design,and the the optimum nutrient ingredients combination(%):glucose 1.0,starch 2.0,soya flour 2.0,and yeast extract 0.5.on these conditions,the verification experimental results showed and the maximal biomass is 1.97 g/100 ml.

Key words: Cordyceps sinensis, Ganoderma lucidum HG, mixed culture