Abstract: Solid-propellant and liquid-propellant launch vehicles have their own characteristics, both playing an important role in space ransportation systems of space powers. This paper reviews and summarizes the development history of solid-propellant launch vehicles, and analyzes their technical characteristics including multiple stages, large payloads, complex separation, diverse operation modes, fast response, and mission adaptability as well as unique advantages in launch ctivities. This paper analyzes and proposes four development laws for solid-propellant launch vehicles, including improving omprehensive performance, infusing heritage with innovation, unitization and seriation, and optimizing power systems. Finally, this paper proposes the opportunities and challenges faced by solid-propellant launch vehicles based on market demands.