Monocyte, should refer to monocytes, the percentage of high can be seen in physiological and pathological; physiological high common in children and infants, is a normal phenomenon, and pathologically high can be seen in viral infections, bacterial infections, hematologic diseases, parasitic infections and other diseases. Monocyte is the largest blood cell in the blood, belongs to the white blood cell, is the main part of the body’s defense system, participates in the body’s immune response, has the role of phagocytosis and killing pathogens, and can identify and kill the ability of tumor cells, therefore, when the body occurs inflammation and other infectious diseases, it will lead to the monocyte percentage increase. High percentage of monocytes can be seen in children and infants, belong to the physiological increase, do not need to be treated; pathological increase can be seen in malaria, typhoid fever, acute infectious diseases or acute infectious diseases such as recovery, and Hodgkin’s and other hematologic diseases. If the monocyte percentage is physiological, no special treatment is needed; if it is pathologic, relevant examinations should be done to confirm the cause of the disease and active treatment should be carried out under the guidance of doctors.