A high speed parallel detection of all 14 channels is offered by RPG-HTAPRO-G3 ground-based microwave radiometer (short for RPG) with its two 7-channel-filterbank receivers. Analysis and evaluation of retrieval products of RPG microwave radiometer, such as temperature, water vapor density and relative humidity, are presented in this paper. The results show that there have better correlation and consistency between observations of RPG and radiosonde for temperature and water vapor density than for relative humidity. The quality of RPG observations can be improved by maintenance. By comparing the mean bias (MB) and rootmeansquare error (RMSE) of retrieval products from RPG in different height on non-rainy days, it is revealed that temperature below 1 000 m is generally more accurate than in other heights. The value of MB and RMSE of water vapor density are higher close to the ground and decrease with height. Significant errors lie in RPG relative humidity observations, which is less accurate than those of temperature and water vapor density. On rainy days, the variation trends of MB and RMSE of temperature, water vapor density and relative humidity in different heights are similar to those in non-rainy days, but the values of MB and RMSE are larger. The MB and RMSE of temperature below 2 000 m are less than those in other heights. The MB of water vapor density below 3 000 m are positive, which means retrieval water vapor density are larger than those measured by radiosonde. MB and RMSE of relative humidity are higher than temperature and water vapor density obviously on rainy days as well.