After collecting and sorting the domestic and foreign standards, we analyzed the differences between laser additive manufacturing (LAM) and the conventional forging and casting in forming technology, microstructure, defects and the causes, internal quality and mechanical properties. It revealed that compared with conventional forming and casting, the manufacturing cycle of LAM is shorter and the material utilization is higher; the porosity in the blank fabricated by LAM can reach class A1, which is lower than forging class AA. Compared with casting, porosity can reach class B. Yield strength of titanium alloy by LAM in transverse and horizontal are lower than forging and casting by 3.4%, and tensile strength that of forging and casting by 0.78% respectively.