"Lingyun" is the first liquid rocket engine launched by Kyushu Yunjian for the commercial aerospace market. It is the first liquid engine product in the domestic aerospace field that has multiple start-ups, deep variable thrust capabilities, and supports rocket recycling and reuse. Excellent multiple starting ability and 20% -100% measured variable thrust performance, through multi-stage parallel connection can meet the launch, recovery and reuse of small liquid rockets, suitable for a variety of loads, scenarios, and in the upper stage of the rocket has a broader demand. At present, the "Lingyun" engine has completed the deep variable thrust thermal test evaluation and passed the customer review.