The service performance and effects of the different details of spun molybdenum crucible on sapphire crystal structure and during the preparation of sapphire single crystal were analyzed, based on which the failure forms and elements of quality control of spun molybdenum crucible were proposed. The hot multi-spinning processing of shearing and rheological deformation of molybdenum plate was developed, and its processing parameters, including spinning wheel load factors (roller forming angle α<sub>0</sub>, roller radius D<sub>ρ</sub>, roller radius ρ and angle adjusting angle β), wall thinning rate ψ<sub>t</sub>, roller feed f, core mould - roller clearance δ, spindle speed n, spinning temperature, heating method, annealing temperature and annealing time, were experimentally studied. The quality affecting factors and causes and solutions of molybdenum crucible, including outer and inner cracks in bottom corners, deep burrs in outside surface of side walls, cracks in open ends, collapsed bottom corner, insufficient wall thickness, circumferential uneven thickness and size errors in open ends, were comprehensively discussed. Meanwhile the evolution law of microstructure during the spinning process of molybdenum metal was presented.