Specialist nurses play a great role in reducing medical expenses, improving medical quality and reducing medical complications, especially among intensive care nurses, which is crucial to improve the cure rate of critically ill patients. The definition of specialist nurse in China: specialist nurse refers to a nurse who has obtained qualifications in a specific nursing field, has skilled nursing skills and knowledge, and has completed the education courses required by specialist nurses. RNClinicalNurseSpecialist: engaged in advanced clinical nursing and clinical teaching. In AJN (American Journal of Nursing) 1900, a paper entitled "Specialized Nursing" first put forward the concept of specialized nursing. The "nursing clinical experts" naturally formed in nursing practice are the embryonic form of CNS, which refers to nurses who have rich experience, advanced professional knowledge and superb clinical ability in a certain clinical field and can provide patients with the best nursing service. In addition to direct nursing work, it also plays the role of consultation and guidance, and its authoritative position is recognized by society and profession. In fact, CNS not only has the above characteristics, but also needs to be qualified, follow the practice standards and be a senior clinical nursing worker. Provide professional services for health care customers in special fields, such as geriatrics, cancer, ostomy, incontinence, dialysis, organ transplantation, asthma, newborn, maternal and child health care, diabetes and chronic obstructive pulmonary disease. There are special posts and responsibilities, which has become the division of labor of nursing specialty. Specialist nurses are divided into general specialist nurses, senior specialist nurses and clinical nursing experts. General Specialist Nurse: The popular senior clinical specialist nurse is hereinafter referred to as APN (Advanced Specialist Nurse): Now the concept of specialist nurse in our mind refers to senior specialist nurse. Clinical nursing experts: have scientific knowledge and advanced clinical practice related to a certain nursing field, have the ability to analyze complex clinical problems, have extensive theoretical knowledge and can be properly applied, and can foresee the short-term and long-term effects of nursing measures. Take patients/parties)/families as professional service objects. Master's degree and doctoral degree study. Obtain professional qualifications and certificates. Therefore, a specialist nurse will never become a nurse after graduation, and she can't take the exam if she wants to. It takes a long accumulation process. There is a process from "all-around" to "specialist", which requires nurses to constantly improve themselves in their daily work.