After four years of MD in medical school, you must pass the first and second parts of USMLE, and then participate in clinical practice and resident training for five to eight years. The salary during the training period is very low. During this period, you haven't obtained a complete medical license and can't practice medicine independently. Training can only be conducted in teaching hospitals under the supervision of senior doctors. Before the end of the training, you must pass the medical license of a surgeon.
Neurosurgery and plastic surgery are 8 years of clinical internship hospitalization training, and other surgery is 5 years of clinical internship hospitalization training.