Vortex flowmeters are widely used in the measurement of steam, gas and liquid flow due to their advantages such as simple structure, good stability and wide range ratio. However, its measurement accuracy is closely related to the characteristics of the medium. If the medium does not meet the requirements, it may lead to measurement errors or even damage to the instrument. This article will conduct a detailed analysis of the key requirements of vortex flowmeters for the measured medium, assisting users in correct selection and application.