For dual fluid cooling technology of high-temperature turbine blade of heavy-duty gas turbine, we have designed and built the steam heat transfer enhancement test platform of turbine blade(vane) internal channel with which we can research heat transfer and friction characteristics of steam/air in blade internal cooling channel with rib turbulators. Steam and air coolants were supplied by air compressor and steam generator, experimental investigation of convection, jet impingement, pin fins of steam/air and heat transfer and friction characteristics of different cooling structures can be carried out with the platform. So, we can reveal the influence law of flow resistance, heat transfer enhancement, various cooling geometries and steam/air’s aerodynamic parameter, and we can know the best cooling geometry and heat transfer correlations of steam/air in blade internal cooling channel.