Abstract: Based on the Metop-A occultation and L-band sounding data, the accuracies of temperature and humidity profiles retrieved from MP-3000A microwave radiometer are assessed,and the detecting characteristics of different weather processes are also analyzed.Results shows that:（1）There is a significant positive correlation of temperatures from microwave radiometer and occultation,and the correlation coefficient of lower level is higher,and the average deviation is smaller in the summer while larger in winter.The temperature from microwave radiometer is higher than that from occultation under 4 km, especially during precipitation period.The correlation of relative humidity is a little higher than that of temperature,and it is higher in the summer than in the winter.The negative deviations are larger during precipitation period under 1 km and from 4 to 6 km.（2）There is also a significant positive correlation between air temperature retrieved from microwave radiometer and observed by L-band sounding.The deviations near the surface are the smallest and they are smaller in 08:00 than these at 20:00.The relative humidity retrieved from microwave radiometer is larger than that observed by L-band sounding,and the detection accuracy is better at 20:00 than at08:00.（3）The humidity increases and temperature decreases near surface when the radiation fog appears.During precipitation period,high humidity region is detected by microwave radiometer under 5 km.The inversion layer will appear in the middle and lower layers when there is a rising process of warm and wet air mass due to the condensation latent heat in the high level air and then adiabatic cooling in the lower level.