The temperature values measured at different times in febrile patients are recorded on the temperature chart, and the temperature points are connected to form a fever temperature curve, and the different forms (shapes) of the curve are called heat patterns. The different shapes of the curve are called thermotypes. The thermotypes of fever due to different causes are often different. The common clinical fever types are as follows: 1. Retained fever: The body temperature is maintained at a constant high level of 39-40℃ or more for several days or weeks, and the temperature fluctuation range does not exceed 1℃ within 24h. Commonly seen in lobar pneumonia, typhus and typhoid fever hyperthermia. 2, flaccid fever: also known as septic fever type. Body temperature is often above 39℃, fluctuating widely, fluctuating more than 2℃ within 24h, but all above normal level. Commonly seen in sepsis, rheumatic fever, severe tuberculosis and septic inflammation, etc. 3.Intermittent fever: The body temperature rises to a peak and then lasts for a few hours, and then rapidly drops to normal level, and the fever-free period (intermittent period) can last from 1 day to several days, so that the high fever period and the fever-free period alternate repeatedly. It is common in malaria, acute pyelonephritis, etc. 4.Wave fever: The body temperature gradually rises to 39℃ or above, then gradually decreases to normal level after several days, and gradually rises again after continuing for several days, and so on repeatedly. Commonly seen in brucellosis. 5.Return fever: The body temperature rises sharply to 39°C or above, lasts for several days and then drops abruptly to normal level. The period of high fever and the period of no fever each last for several days and then alternate regularly once. It can be seen in Hodgkin’s disease, etc. 6.Irregular fever: The temperature curve of fever is not certain regular, which can be seen in tuberculosis, rheumatic fever, bronchopneumonia, exudative pleurisy, etc.