The extinction performance of 30 g nano-Ni powder smoke to 1.06 μm and 10.6 μm laser were tested in 20 m³ smoke chamber. Its mass extinction coefficient is 1.542 and 1.078 m²?g^-1respectively, and the sedimentation rate is 1.035×10^-3 m?s^-1. Compared with the smoke performance of conventional materials such as HC, RP, oil, graphite, carbon black, nano-Ni powder smoke has better extinction capability to 1.06 μm and 10.6 μm laser and possesses the better suspending characteristic in the air.