Abstract: Combat efficiency of loitering missile attacking time-critical target (TCT)is analyzed using Monte Carlo method. The battle environment, model parameters and target characteristics are assumed first, and the Monte Carlo model is set up by use of time stepping emergence distance. The model introduces an ergonomics factor-morale index, and reveals the combat characteristics of loitering missile and dynamic interactivity. At last both the combat efficiency and proportion of effectiveness to life cycle cost (PE LCC) are analyzed. The simulation results show that it has a great PE LCC of loitering missile attacking TCT, and has much more advantages in the battle compared to other weapon equipments.