With the technique of laser rapid forming (LRF), tensile samples of 304 stainless steel are prepared, on which tensile test is done. The surface is observed by optical microscope, the fracture morphology of the specimens is observed by scanning electronic microscopy (SEM), and chemical compositions of sampling points are analyzed by energy dispersive spectrometer (EDS). The results show that the sample′s microstructure contains small grains with unidirectional solidification characteristic, which form micro-holes and micro-cracks inside the formed parts. In specimens of tensile fracture, there are ductile fracture characteristics, and the contents of oxygen and silicon in some area of fracture surface are higher. These worsen the mechanical properties of the specimens.