This paper introduces the operating principles of HY-2B satellite microwave radiometer， acquisition of satellite ephemeris，calculation of antenna beam pointing，and a series of coordinate system conversion methods． A suitable geolocation algorithm is presented for the conical scanning mode of microwave radiometer and the location calculation is carried out． By modifying some parameters，the geolocation errors are corrected． By overlaying the modified location results in typical areas at different latitudes with high-precision geographical base map，it can be seen that they match well，so the algorithm has certain practical value．