L625 Rayleigh scattering lidar made the measurements of air density and temperature over the altitudes of 30~43 km at Hefei (31.9。N／117.17。E)，two laser beams with 355 rim and 532 nm were employed，respectively The results of lidar agreed well with ones of NOAA／NMC and NASA／HALOE．Generally,the differences of density were about 10％ and temperature biases were less than 2 K between the altitude 34 km and 43 km．but a 1ittle larger below 34 km．