Our company maintained a BHS high power multi-shaft gearbox manufactured by a large domestic wind turbine factory. The Max. power of the gear box is nearly 11000kw, the Max. gear diameter is 2280mm, the circular velocity of the gear pitch is 145m/s, and the weight of the whole gear box is nearly 30 tons. Our detailed drawing and calculation of the gearbox, box maintenance, gear reprocessing and machine assembly test and other operations make the leaders of fuit BHS and baosteel who come to our company for investigation feel amazing and praise us. The project is now function well.