The driving force and the energy conversion between condensation, driving kinetic energy of water and pressure oscillation for steam jet have been experimentally investigated in the steam pressure range of 0.2-0.5 MPa and water temperature range of 293-323 K. The axial velocity of the water decreases with the increasing axial distance from the end of the steam plume, and increases with the increasing steam pressure. The driving force are in the range of 1-20 N under different steam pressure and water temperature in the experimental conditions. The driving power increases with the increasing steam pressure. In the stable condensation region, the pressure oscillation power increases with the increasing steam pressure, and decreases with the increasing water temperatures. More than 99% of the energies input are transferred to heat energy of water, and little energy is converted to the driving energy and oscillation energy of the water. The condensation plays a leading role in the energy conversion for steam jet condensation. (C) 2017 Elsevier Ltd. All rights reserved.