The 300hPa monthly mean temperatures and the 100hPa monthly mean heights derived from the NCEP/NCAR reanalysis data from 1958 to 1997 are analyzed by four data processing schemes,respectively.The results are compared with one another.It is shown that the dependability of the 300hPa temperature data is super to that of the 100hPa height data.The temporal and spatial variations of the temperature and the height fields are also analyzed and the periodic analysis of the two elements is conducted by means of the Morlet wavelet technic.It is found that the first EOF modes of the two fields both have good spatial consistence and temporal persistence,as well as evident interannual and decadal variations with main periods of about 10 years and 2~5 years respectively.