In this paper, the mesospheric sodium data, observed from Mar. 1 to Mar. 3 1996 in Wuhan (30°32N, 114°22E) by a laser radar, have been analyzed, and the distribution of the Na atoms density with the altitude and the relation of the profiles of the Na atoms density with time have been got. The results point out that the distributions of the Na atoms density change vs time apparently. The sodium layers lie between 80￣105 km, and the maximum Na density lies between 92￣95 km, its value varies from 1×10 9 to 3×10 9 atoms/m 3 when there are no meter rains.