The radio-frequency interference (RFI) over Europe land is identified and analyzed based on advanced microwave scanning radiometer-E (AMSR-E) observations from June 1 to 16, 2011 using modified principal component analysis algorithm. The X band AMSR-E measurements of England and Italy are mostly interfered by the stable, persistent active surface microwave transmitters. While the RFI source of other European countries is the interference of the reflected geostationary TV satellite downlink signals to the measurements of spaceborne microwave radiometer. The RFI location and intensity derived from the geostationary TV or communication satellite changes with time within observation period. The observations of spaceborne microwave radiometer of desending portions of orbits are usully interfered over Europe land, while ascending portions of orbits are hardly interfered. The RFI location and intensity from the reflection of downlink radiation are highly dependent upon the relative geometry between the geostationary satellite and the measuring passive sensor. Only these field of views which the scanning azimuth of spaceborne instrument is close to the relative azimuth to the geostationary satellite are easily effected by RFI.