The ECMWF and NCEP reanalysis data are compared of monthly mean temperatures in lower stratosphere using Lorenz circulation decomposition.The results are given as follow:in DJF and JJA,the zonal mean temperature of 30°S～30°N is a cold band at 100hPa.In this area,the climatological temperature normals of ECMWF reanalysis are lower than those of NCEP reanalysis significantly,and the interannual variances of ECMWF reanalysis are smaller than the ones of NCEP reanalysis.Several high and low centers in midlatitudes reveal some shortcomings in NCEP temperature stationary waves.But the thermal anomaly of NCEP reanalysis is superior to ECMWF reanalysis,because ECMWF reanalysis fails to capture the marked warming in stratosphere (100hPa and 10hPa) after three strong volcanic eruptions.