Nursing is an applied science, which is divided into family nursing and paid nursing. Paid nursing must be carried out in accordance with the relevant provisions of the laws and regulations stipulated by the Ministry of Health, National Health Commission and the Ministry of Health. Basic or routine nursing should be completed in an orderly, purposeful and planned manner, and the basic situation of patients' weight should be observed and understood, and disease data should be monitored or obtained according to the changes of their illness, so as to cooperate with doctors to complete the treatment of patients, strengthen the examination and education of infusion, handle medical disputes in time and prevent the occurrence of medical accidents. Monitor vital signs of critically ill patients, collect specimens, collect and analyze weight and nutrition regularly, and take care of patients' daily life, daily activities, medication and safety from the aspects of physiology, psychology, social culture and spirit. For example, patients with myocardial infarction can be manifested as: physiological-pain, chest tightness, shortness of breath; Psychology-fear, fear; Ideological culture-the degree of self-knowledge and understanding of disease knowledge; Mentally-whether it is valued and respected by nurses and doctors.