Abstract: Pure nickel exhibits excellent corrosion and oxidation resistance, high thermal conductivity, and hightemperature stability, making it widely used in industries such as aerospace, military, and marine. This study employs Laser Directed Energy Deposition（LDED） technology to prepare bulk samples of pure nickel powder under different laser power settings, and characterizes their formability and microstructural properties. The results show that, under the experimental conditions, the formability of pure nickel via LDED is good, with relative densities exceeding 99.9% in the laser power range of 600W to 1200W. At a laser power of 800W, the relative density reaches its maximum, indicating the optimal processing parameters. At this point, the samples exhibit a typical coarse columnar grain structure, with an average tensile strength of （371.59±49.86） MPa and an average elongation at break of 32.64%±3.16%. The coefficient of thermal expansion increases with temperature, measuring （10.75±0.77）10-6/K at 100℃ and （17.13±0.76）10-6/K at 500℃. The findings of this study provide important process references for the high-quality additive manufacturing of pure nickel components.