The [1 + 1] (A) over tilde (2)Pi (u)-state resonance enhanced two-photon dissociation process of CS2+ molecular ions has been investigated by measuring the photofragment S+ excitation (PHOFEX) spectrum in the wavelength range of 424-482 nm, where the CS2+ molecular ions were prepared purely by [3 + 1] multiphoton ionization of the neutral CS2 molecules at 483.2 nm. The PHOFEX spectrum was assigned essentially to the CS2+((A) over tilde (2)Pi (u))<-- CS2+((X) over tilde (2)Pi (g)) transition, and the dissociation mechanism of CS2+ was preliminarily attributed to (i) CS2+((X) over tilde (2)Pi (g))--> CS2+((A) over tilde (2)Pi (u)) through one-photon excitation, (ii) CS2+((A) over tilde (2)Pi (u))--> CS2+((X) over tilde dagger) via internal conversion process due to the vibronic coupling between the (A) over tilde and (X) over tilde states, (iii) CS2+((X) over tilde dagger)--> CS2+((B) over tilde (2)Sigma (+)(u)) through the second photon excitation, and (iv) CS2+((B) over tilde (2)Sigma (+)(u))-->S+ + CS owing to the potential curve crossing with the repulsive (4)Sigma (-) state correlated with the first dissociation limit.