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Ionization channels of the molecular ion H2+ for various initial vibrational states in intense laser field (80fs,800nm,I =6.8 × 1013 W/cm2) are theoretically investigated by numerically solving the time-dependent Schr(o)dinger equation.The results confirm that the channels largely depend on the selection of initial vibrational states by analyzing the variations of peak locations in the nuclear initial kinetic-energy-release spectra.Furthermore,the selection of the ionization channels is sensitive to the wavelength of the laser pulse.In addition,time-dependent competition between direct multi-photon ionization and charge-resonance-enhanced ionization are is discussed.