The doctor's qualification is illegal practice of the crime of illegal resistance, the identification of the qualification identity is the key to the application of illegal practice of medicine, only consider the form of value of the "document" and "double evidence" there is improper expansion of the risk of illegal practice of medicine, should be around the legal interests, only infringe on public health security legal interests of individuals can constitute illegal practice of medicine.Without a doctor's license and a doctor's license to jointly carry out medical behavior, the perpetrator in principle does not constitute the crime of illegal practice of medicine, only with a doctor's license does not guide the supervision of medical behavior may constitute the crime of illegal practice.