The problem of mismatch between hydrogen production area and use area can be solved with hydrogen-injected into natural gas pipeline transportation effectively. However, the flow state and thermodynamic characteristics have been changed in the original pipeline system after hydrogen-blended into natural gas. Therefore, the influence of hydrogen-blended into natural gas of compressor and metering was summarized in pipeline transportation system. Then, thermophysical parameters of hydrogen-blended into natural gas was reviewed, including density, temperature, pressure, viscosity, specific heat capacity, interchangeability, compression factor, calorific value and Joule-Thomson coefficient, et al. Finally, the development trend of research on thermodynamic property parameters of hydrogen-blended natural gas were prospected. The summary of thermodynamic parameters can provide references for the theoretical research and engineering application of hydrogen-blended natural gas pipeline transportation.