Abstract: This paper introduces a rocket engine spout vacuum and pressure brazing technology principle and characteristic of vacuum braze welding.introduces the structure and process equipment.The technology is on the rocket engine spout dissection in time,to the temperature within the furnace brazing,filled with protective gas,process to meet the required 0.8Mpa outer pressure condition,the rocket engine spout to form a vacuum brazing and vacuum diffusion welding two welding methods of combining a comprehensive process.