NOVELTY - Culture composition comprises (in pts.wt.): carambola leaves (20-30), rapeseed cake (12-16), potato seedling (15-20), broad bean straw powder pole (13-16), caltrop shell powder (10-15), leaf bran (8-13), corn leaf powder (5-10), Chinese yam (5-10), cattle bone powder (3-8), agar (2-5), vinegar (5-10), superphosphate (0.4-0.9), ammonium sulfate (0.5-0.8), potassium nitrate (0.5-0.8), gypsum powder (1-2), quicklime (1-3) and nutrition additive (5-10). The nutrition additive comprises (in pts.wt.): diatomite (100-110), jade powder (20-24) and nanometer carbon (0.1-0.2).    USE - Culture composition used for cultivating mushroom (claimed).    ADVANTAGE - The culture composition is simple, and has improved nutrition value and biological conversion rate.    DETAILED DESCRIPTION - Culture composition comprises (in pts.wt.): carambola leaves (20-30), rapeseed cake (12-16), potato seedling (15-20), broad bean straw powder pole (13-16), caltrop shell powder (10-15), leaf bran (8-13), corn leaf powder (5-10), Chinese yam (5-10), cattle bone powder (3-8), agar (2-5), vinegar (5-10), superphosphate (0.4-0.9), ammonium sulfate (0.5-0.8), potassium nitrate (0.5-0.8), gypsum powder (1-2), quicklime (1-3) and nutrition additive (5-10). The nutrition additive comprises (in pts.wt.): diatomite (100-110), jade powder (20-24), nanometer carbon (0.1-0.2), radix salviae miltiorrhizae (1-2), lily powder (2-3), Coix seed oil (1-2), barley powder (1-2), Phyllanthus reticulatus powder (10-12), bean dregs (10-12), gypsum (3-4), stone powder (4-5), ascorbic acid (1-2) and brown sugar (10-12). The nutrition additive is prepared by mixing raw material , and then crushed. The obtained material is stirred uniformly to obtain the desired product. An INDEPENDENT CLAIM is included for a method for preparing culture composition for cultivating mushroom, which involves:    (A) crushing potato seedling, rape seed cake and Chinese yam;    (B) mixing the crushed material to obtain the mix powder;    (C) drying cattle bone powder with slow fire;    (D) adding vinegar to the obtained material;    (E) mixing the obtained mixture with the obtained mixed powder;    (F) adding water to the obtained mixture;    (G) fermenting the obtained material in a fermentation pool for 25-30 days;    (H) drying the obtained material;    (I) adding remaining raw material to the obtained material;    (J) adding water to the obtained mixture;    (K) fermenting the obtained material in a fermentation pool for 8-14 days;    (L) adding water to the obtained material;    (M) putting the obtained material in a bag (550-750 g); and    (N) sterilizing the obtained culture composition.