Readiness is one of the most important tactical and technical indexes for the surface-to-air missile weapon system of measuring the ability to perform combat tasks, how to determine the weapons readiness indicator is an important part of demonstration. The paper analyzes the readiness parameters characteristics, and proposes the parameters of surface equipment and missile, the available degrees is using similar equipment analog and the Delphi method demonstrates the use of availability, this may lay the foundation for equipment reliability, maintainability, supportability argument.