In this study

taking advantages of free design

high geometric flexibility and forming complex structure combining of the 3D printing technology

combining with the traditional manufacturing process features of low cost and high efficiency

and using 304L austenitic stainless steel for nuclear as the object of study

an additive and reductive hybrid manufacturing procedure combining with traditional rolling and selective laser melting（SLM） is used for 3D printing forming of 304 L stainless steel parts based on direct laser deposition（DLD） technology. The DLD technological parameters of 304 L stainless steel for unclear are verified

including microstructure

mechanical properties and inter-granular corrosion resistance tests. The result shows that 304 L stainless steel processed by DLD technology has high performance stability

small dispersion between parallel samples

and good tensile strength

high impact property and excellent corrosion intergranular corrosion resistance property

which all meet the acceptance requirements. The verified DLD proce-dure is used to join the SLM material and the traditional rolling plate

the joint part is well fused with no micro-cracks and precipitation affecting the joint performance and the nondestructive testing on the sample surface also meets the acceptance requirements. Based on DLD technology

the additive and reductive hybrid manufacturing procedure combining with traditional manufacturing and SLM process has the technical advantages of traditional procedure and 3D printing

and the material performance meets the acceptance requirements.