As the standards of NASA and EOS data storage and distribution, HDF-EOS specialized in dealing with diversified EOS products. EOS data are used widely in meteorological fields, so it is the key to master the HDF-EOS data format and data import to the further development and application of EOS data. The structure of image module, scientific data, and Vdata module (tabular data) in HDF data files and the data format of dot, strip, and grid data and metadata in HDF-EOS files, as well as the relative software to open HDF format data to import and browse HDF-EOS data, are introduced.