Abstract： Rosenbluth et al. have suggested that energetic particles trapped at unfavorable curvature region of a tokamak can provide an access to the second stability region. The ECRH processes for achieving this novel state in reactor tokamak is proposed. The RF within the proper ranges of frequency and wave vector are injected from the outside of tokamak of a chosen magnetic surface. Only a few percent of electrons is heated by the high electron cyclotron harmonic resonance successively. The numerical results show that heating is efficient for both ordinary and extraordinary modes.