Measurements of microwave emission from atmospheirc oxygen by a 4-channel 5mm radiometer are simulated with selected data from Nanjing radiosonde observations during 1984. Atmospheric temperature profiles are derived from radiative brightness temperature measurement simulations by physical iteration, using the bi-monthly climatic averages as first guess. According to the error statistics over 120 profile retrievals, the maximum RMS differences between the retrievals and radiosondes are less than 3 K below 300 hPa and less than 2 K below 700 hPa. The temperatureinversion near the ground surface can be detected.