In this paper, the behavior of a typical jack-up platform under accidental loading of ship collision was investigated. The studied platform was modeled using ANSYS software and analyzed dynamically under ship impact. The platform was also analyzed dynamically under secondary ship impact. The initial collision results showed that the main energy absorption mechanism in impact to jack-up platform is overall deformation of platform it also shown that environmental preloading in some cases causes yielding or fracture of impacted member. The subsequent collision analysis showed that leg chords can resist to a subsequent impact and the platform in both first and second impacts has local damage such as indentation of the chord wall but the rest of the structure remains almost intact. Finally, the platform was modeled in damaged condition and analyzed dynamically under one-year environmental loads and the value of maximum stress and probability of platform failure was investigated. In addition, the value of stress and displacement in the intact and damaged platform has been compared and the results are analyzed.