NOVELTY - Preparing a Pleurotus geesteranus culture medium comprises: mixing Boehmeria nivea bone meal (70-80 wt.%) , rice bran (17-27 wt.%), light calcium carbonate (1-1.5 wt.%), sucrose (1-1.5 wt.%) and dipotassium phosphate (0.1-0.2 wt.%); adding water to the mixture, stirring uniformly and bagging, in which the bagging material contains water (63-66%); and sterilizing the bagging material for 1-2 hours at 121 degrees C under high pressure or for 8-12 hours at 100 degrees C under constant pressure.    USE - The method is useful for preparing a Pleurotus geesteranus culture medium.    ADVANTAGE - The method increases the yield upto 40-50%, reduces the production cost of the culture medium and avoids burning of the Boehmeria nivea bone to be applied to the farmland and thus protects the environment from being polluted.    DETAILED DESCRIPTION - Preparing a Pleurotus geesteranus culture medium comprises: mixing Boehmeria nivea bone meal (70-80 wt.%) , rice bran (17-27 wt.%), light calcium carbonate (1-1.5 wt.%), sucrose (1-1.5 wt.%) and dipotassium phosphate (0.1-0.2 wt.%); adding water to the mixture, stirring uniformly and bagging, in which the bagging material contains water (63-66%); and sterilizing the bagging material for 1-2 hours at 121 degrees C under high pressure or for 8-12 hours at 100 degrees C under constant pressure. The Boehmeria nivea bone meal is 3-7 mm long rod-like material after the Boehmeria nivea bone is crushed. An INDEPENDENT CLAIM is also included for cultivating Pleurotus geesteranus comprising inoculating, generating mycelium, fruiting, picking up in batch and turning to a moisture place. The inoculating comprises cooling the Pleurotus geesteranus culture medium to less than or equal to 30 degrees C and inoculating the Pleurotus geesteranus strain. The generating mycelium comprises culturing the inoculated Pleurotus geesteranus culture medium for 25-30 days at 22-28 degrees C and relative air humidity of 80-90% till the mycelium is filled in the bag. The fruiting comprises opening the mycelium plastic bag, placing it on a culture frame, watering for 2-3 times every day at 18-26 degrees C and relative air humidity of 85-95%, ventilating and radiating diffused light with the light intensity of 300-500 lux to grow the Pleurotus geesteranus. The picking up in batch comprises picking up the Pleurotus geesteranus when the fruiting body is 20-30 mm in diameter, cap is flat and edges are rolled inwardly. The turning to a moisture place comprises removing the root on the surface of the culture medium, supplementing water to the bag in such a way that each bag is increased by 30-50 g, binding the bag, irritating for 1-2 days at the low temperature less than or equal to 10 degrees C to recover the mycelium to grow, opening the bag when the hairy mycelium is generated and the culture medium grows the next stubble Pleurotus geesteranus.