The Conical Scan Microwave radiometer (CSMR) of the HY-2 satellite is a rotating microwave imager. It covers frequency band from 6.6GHz to 37GHz, which receives the earth radiation by two feed horns, and provides the capability of observing the sea surface temperature, the wind speed, the water vapour and the liquid water etc. It was launched at 16 august 2010. This paper provides an overview of the the instrument's characteristic and the inter-satellite calibration results are also presented.