Ma Jun's youth is playing, but he doesn't realize his talent. When I was a doctor, I lived in poverty, so I improved the silk loom and became famous for it. Later, he served as a minister in Wei State and developed machinery at the same time. Although he was not successful in his life, he studied hard and designed and manufactured many kinds of machinery. When I was in Wei Mingdi, I saw that there were 50 nie (pedal control board) for 50 warp and 60 nie for 60 warp, so I changed the loom to 12 nie, which greatly improved the efficiency. When I was in Luoyang, I invented the irrigation and drainage waterwheel, which was called "rollover". It is powered by running water, which can continuously and automatically lift water, with convenient operation and greatly improved efficiency. He also researched and manufactured a compass, improved Zhuge Liang's crossbow and improved the stone delivery vehicle for siege. His "Water changes into a hundred plays", powered by water and driven by mechanical wooden wheels, makes puppets perform automatically, and the idea is very clever.

Ma Jun is good at clever thinking, pays attention to practice, and has confidence in technical issues, but he is not good at rhetoric. Ma Jun has made many inventions in handicrafts, agriculture and military affairs. He was the best machinery manufacturer in the Three Kingdoms period. Even in the history of thousands of years in ancient China, he was a master of machinery. At that time, a writer named Fu Xuan once praised him and said, "Mr. Ma, the name of the world, is unique." However, due to the corruption and decline of the feudal ruling class, many of Ma Su's inventions were ignored. His whole life, from youth to old age, has been frustrated. Although I used to be an official, my work was still obstructed and despised, and my skills have not developed smoothly.