The microphysical characteristics of explosive cyclone EC1 over the Northeastern Pacific from 23 to 26 December 2006, explosive cyclone EC2 over the Northwestern Pacific from 31 March to 2 April 2013, and explosive cyclone EC3 over the Northeastern Pacific from 24 to 26 October 2015 were analyzed by using CloudSat satellite data, MODIS (Moderate Resolution Imaging Spectroradiometer) satellite visible imagery, GOES (Geostationary Operational Environment Satellite) satellite infrared data, as well as ERA5 data. The results indicated that at the mature stages, the clouds associated these three explosive cyclones all rotated counterclockwise, with "spiral-shaped" structure and clear "eye". The height of cloud top near "eye" region was lower than that of outer cloud. The major compositions of clouds near "eye" region were Nimbostratus, Cumulus and Stratocumulus, respectively. The outer cloud was mainly composed of Nimbostratus, characterized with large values of radar reflectivity, and the ice particle number concentration were smaller than that in deep convection and Nimbostratus. The downward extension of upper-level PV indicated that the dry and cold air from the stratosphere intruded into the interior region of cyclone, which was one of the important reasons for the formation of clear "eye" structure near the cyclone center.