Using a neutral N2 beam as target,this paper studies the dissociation of N+2 in intense femtosecond laser fields (45 fs,～1×1016 W/cm2)at the laser wavelength of 800 nm based on the time-of-flight mass spectra of N+fragment ions.The angular distributions of N+ and the laser power dependence of N+ yielded from different dissociation pathways show that the dissociation mechanisms mainly proceed through the couplings between the metastable states(A,B and C) and the upper excited states of N+2.A coupling model of light-dressed potential energy curves of N+2 is used to interpret the kinetic energy release of N+.