Abstract: Molybdenum, as a refractory metal, is widely used in nuclear industry and aerospace because of its good high temperature mechanical properties and low expansion coefficient. The pure molybdenum prepared by laser powder bed melting（LPBF） has significant design advantages and industrial production efficiency. To improve the LPBF production efficiency, the optimal process parameters of 30μm layer thickness selective laser melting technology were obtained through process optimization, and the crack-free pure molybdenum sample with a density of 99.2% was prepared. Through XRD and EBSD characterization, it is found that there are preferred orientation and different degree of lattice distortion in the pure molybdenum samples with different parameters, and the texture strength of the side is greater than that of the bottom. The optimal sample hardness is 206HV, unidirectional compression strength and elongation are 566MPa and 20.7%, respectively. This study lays a foundation for the preparation of pure Mo components with 30μm thickness and excellent mechanical properties without cracks by LPBF.