Abstract: In order to ensure the performance of ultrasonic flowmeter measurement stability, ultrasonic flowmeter must be strictly taken a verification before being put into produetization. A verification method which is reliable is proposed in this paper. This method which is based on national verification regulation adjusts the flow point of verification according analyzing the accuracy influence of ultrasonic flowmeter caused by the fluid state. According to the experiment, the method can reflect the real quality of ultrasonic flowmeter truly and reliably, and can be operated and spreaded easily.