In order to satisfy the requirement of authority and reusability of simulation scenariowe put forward a standardized scenario developing method which is based on two standards. One is abstraction standard of simulation scenario conceptual models based on Conceptual Models of the Mission Spacewith which developers can get simulation scenario conceptual models no bias with military information and establish scientific and authoritative simulation scenario constraint mechanism.The other one is description standard of simulation scenario based on XMLwith which developers can get simulation scenario that has a standard format accepted by simulation industry in order to achieve the goal of reusability. An example is given in simulation applicationwhich proves that the method is rational and efficacious.