The colonial growing rate and spore-forming number of Cercospora sojina Hara are different on the seven kinds of nutrient mediums such as:soybean straw,soybean pod,soybean granule,soybean powder,semi synthetic medium,PDA and V8-juice mediums.The results showed that the colonial on soybean granule,semi synthetic PDA and V8-juice medium grow more quickly than the others.The average growth is 45.60~50.96 mm² every day,but the spore-forming number is different.The spore-forming number(28.4~30.2 spores/visual field)of the semi synthetic and V8-juice medium is greater than PDA and soybean granule medium(2.4~4.2 spores/visual field).The two kinds of mediums selected are compared in the cost and operating method.We concluded that not only the cost of V8-juice medium is cheap,but also the operating is easy too.