A survivability simulation assessment model of the power system was established with a fictitious ship as an ex ample. It is a computer-based stochastic simulation model for the power system attacked by various weapons and multi-damage factors as well. The model was proved to be reasonable and so it can be used to find the deficiencies in the design of the ship power system, offer the improving approachesand analysis results, which is of importance to improving the survivability of the ship power system. The model can be also applied to the survivability assessment of other systems.