Abstract: Sendout metering may directly affect the success of delivery in LNG trading. In the Zhejiang LNG Terminal, the metering skid system composed of ultrasonic flowmeters is used. With the support of sampling, analyzing and monitoring devices, the system can guarantee overall metering accuracy to satisfy demands of relevant trades. This paper reviews the composition and flowrate calculation procedures of the metering system in the Zhejiang LNG Terminal. Key points for design and operation of the metering system are summarized. The results show that periodic calibration and acoustic checks shall be performed to determine "health" conditions of the metering system in timely manner. These measures can facilitate defensive maintenance by operators and enhance accuracy of instrument accuracy within valid calibration period to minimize trade disputes. This paper presents the common problems and relevant countermeasures of ultrasonic flowmeter to provide essential guidance for construction, operation and maintenance of metering system in LNG terminals.