Jeonuigam(典醫監) is one of the Big Three of medical government office through the Joseon dynasty era. But Jeonuigam literature is extremely rare. This paper is to analyze 362 cadets of "Jeonham-saengdoan(前銜生徒案)" by writer of Jeonuigam origin. Jeonuigam filled cadet on a three-year cycle because the national examination for medical officials is conducted on same cycle. Most cadets came from a few meritorious family of medical career officials. Ratio of ten major family stand at 34.91 percent. 373 of the 392 cadets are confirmed as family member of medical bureaucrat. They have a very closed society. Wancheon(完薦) and cadet system strengthen the monopholy power of a few family. The analysis of study confirmed that in the 19th century Joseon(朝鮮) dynasty had monopolized the medical technicians.