The design of indoor airflow organization is an important factor affecting the quality of ventilation and air conditioning systems. It plays an important role in creating a reasonable indoor airflow field, meeting the requirements of indoor environment, human comfort, and energy-saving of air conditioning and ventilation systems. At present, the commonly used airflow organization and air supply methods in air-conditioned rooms in China can be classified into side air supply, diffuser air supply, orifice air supply, slot air supply, nozzle air supply, etc. According to their characteristics, the first three airflow organization methods in air-conditioned rooms with requirements for the allowable fluctuation range of room temperature are currently commonly used; For high-rise spaces with large distances between air conditioning vents and personnel activity areas, such as exhibition halls, sports halls, auditoriums, theaters, etc., nozzle air supply is usually used. Due to its long range, simple system, low investment, and ability to solve construction problems such as difficulty in arranging air ducts in high-rise spaces, it has been widely used in engineering practice. For ventilation and air conditioning environments in high-rise spaces, the selection calculation of air vents generally adopts a non isothermal air supply method with multiple parallel air vents arranged in parallel. That is, the distance between multiple air vents is 510ds, and the jet is overlapped and converged within 1020ds to form a single airflow, and the range is extended. This type of jet is called multi parallel jet. Its characteristic is slow jet expansion and velocity attenuation. At the same end velocity, its range is longer and the drop is smaller than that of a single jet.