In order to improve the mechanical properties of composite propellants, the research status of the mechanical properties of composite propellants at home and abroad in recent years is analyzed. The mechanical properties of composite propellant can be further improved by improving the mechanical properties of binder matrix, enhancing the interface between solid filler and binder matrix, optimizing the composition and particle size distribution of solid filler. The results show that the research can provide theoretical and practical support for further improving the mechanical properties of propellant.