The flame propagation of nanoaluminum cloud in different atmospheres such as CO2, air, and O-2 was experimentally studied in a transparent quartz tube. Measurements of the flame length, height, propagation velocity, and temperature indicate that these parameters undergo regular changes in different atmospheres. The maximum measured temperature in CO2 was lower than that in air. On the basis of these results, the flame propagation mechanism of a nanoaluminum cloud is discussed. Scanning electron microscopy revealed that the combustion products consist of uniform spherical particles. On the other hand, the X-ray diffraction analysis indicated the presence of Al, gamma-Al2O3, theta-Al2O3, and alpha-Al2O3 in the combustion products of nanoaluminum cloud in air and the existence of Al, theta-Al2O3, alpha-Al2O3, and Al2OC when the cloud burns in CO2.