The 6-7GHz band spaceborne microwave radiometer is very important because ocean surface temperature can be observed through cloud with highest sensitivity. Ocean surface temperature is very important in the study of global warming and others. However, 6-7GHz band is not protected in the Radio Regulations (R.R) of ITU-R. In this paper, various interferences to a spaceborne microwave radiometer imagery are classified and introduced. Some analysis is conducted for the first time in the world in the case of surface scattering of down link from mobile satellites to gateways.