Liquid oxygen and methane, with its many advantages such as having rich sources and low temperature of combustion, exhibiting good cooling performance, and being hard to coke with little carbon accumulation, has broad application prospects in reusable engines, making high-performance and high thrust liquid oxygen methane rocket engines a hot research direction for major aerospace tasks such as deep space exploration in the future. The performance parameters of liquid oxygen methane, liquid oxygen kerosene, and liquid oxygen liquid hydrogen propellants are calculated and compared, and results show that high thrust liquid oxygen methane rocket engines are superior in reusable primary propulsion engines. This paper summarizes the development process of high thrust liquid oxygen methane rocket engines at home and abroad, and introduces the six key technologies involved in the development of high thrust liquid oxygen methane rocket engines and the development progress of various technologies in China. Correspondingly, the main problems that urgently need to be solved in the development of high thrust liquid oxygen methane rocket engines in China are identified. The future engineering applications of reusable high thrust liquid oxygen methane rocket engines in China are discussed.

High-frequency combustion instability remains a key challenge in the development of high-performance liquid rocket engines. The physical processes involved have significant characteristics such as cross scale, nonlinearity, and multi-field coupling. Improving the overall understanding of such problems is helpful for systematic research work. This article briefly describes the main characteristics, key physical mechanisms, and research ideas of high-frequency combustion instability in liquid rocket engines, focusing on the research progress in sub-process response mechanisms both domestically and internationally in recent decades. It points out the important significance of studying response mechanisms for different engine combustion rate control processes, summarizes the progress made by different analysis methods, challenges faced, and subsequent development directions, providing reference for engineering management of such issues.