solid rocket motors have the advantages of simple structure, high reliability, and large thrust. They have become an important power device for air transportation and missile, are a key research object for aviation and aerospace superpower. In order to break through the traditional design and management model of solid engines that has long been based on experience and semi-experience, reduce the difficulty of design, development, and maintenance, A management model should be established around the entire lifecycle of solid rocket motors to meet the development needs of rapid iteration, digitization, and intelligence of solid rocket motors. Based on the concept of digital twins, this article divides the development process of digital twins into four stages: physical simulation, computer simulation, virtual reality mapping, virtual reality combination, establishes a digital twin system framework for each stage of solid rocket motors, and the key technologies at each stage were summarized. These can be used as technical routes to promote the development of related disciplines and technology accumulation, and provide theoretical reference for the research and application of solid engine digital twin systems.