External excitation, propagation, and ion heating for the ion‐Bernstein wave (IBW) are studied for the single‐ion and two‐ion species plasmas, using particle simulation. It is found that the value of &ohgr;/&OHgr;inear the antenna position influences the excitation characteristics of the IBW. The wavelength and group velocity of the propagating IBW agree well with those calculated from the linear dispersion relation. Corresponding to the experiment done with the JIPP T‐II‐U device [Phys. Rev. Lett.54, 2339, (1985)], the 3&OHgr;Dheating process in the plasma composed of deuterium‐like and hydrogen‐like ions is investigated. The wave energy is deposited into the bulk and tail of the deuterium‐like ions because of third harmonic cyclotron resonance and the bulk of the hydrogen‐like ions because of 3/2 &OHgr;Hcyclotron subharmonic resonance.The possibility is also discussed that the heating efficiency may not depend on the concentration of the deuterium‐like ion in the 3&OHgr;Dheating in the actual tokamak experiment.