Can be divided into N 1, N2, n 3, N4, N5, N 1 are nurses, N2 is a nurse who has been qualified as a nurse for less than 3 years, N3 is a nurse who has been qualified as a nurse for more than 3 years, N4 is a chief nurse, and N5 is a deputy director and head nurse. According to their academic qualifications, professional level and the needs of the hospital, targeted training is carried out.