Using the level-1 brightness temperature data from the Global Precipitation Measurement (GPM) Microwave Imager (GMI), the typical continental areas contaminated by radio frequency interference (RFI) are identified by spectral difference method, and Europe, East Asia, and South America are selected as the main research areas. Furthermore, the relationship between RFI and satellite azimuth, solar azimuth, and solar zenith angle is analyzed to discuss the impact factors of RFI. The results are shown as follows. The area affected by RFI is wider in horizontal polarization mode than in vertical polarization mode. Compared with the wide range of satellite azimuth corresponding to the strong RFI signal distribution, the angular range of solar azimuth and solar zenith angle corresponding to RFI pixels is more concentrated. When the intensity of RFI is weak, the number of RFI pixels in vertical polarization mode is far more than that in horizontal polarization mode. However, as the intensity of RFI increases, the number of RFI pixels in horizontal polarization mode is more than that in vertical polarization mode, and the greater the intensity, the greater the difference between the number of RFI pixels in the two polarization modes.