Abstract: The ultrasonic metering system in Trans-Uzbekistan Gas Pipeline is introduced with regard to its system composition, equipment installation, signal transmission, etc. based on its current development, specification, principle and structure. The system is composed of 4-channel ultrasonic flowmeter(USM), flow computer (FC), pressure transmitter(PT), temperature transmitter(TT)and gas chromatograph(GC). The signals from USM, PT, TT, GC are transferred to FC. The FC is employed to calculate the volumetric flow based on relevant parameters under standard condition. A couple of technical topics are analyzed and discussed, which provides a direction to the operation and maintenance of ultrasonic flowmeter in flowmeter range under standard condition, noise disturbance, pipe and gas cleaning, small flowrate disturbance, vibration, sound alert, backup shutdown, environment temperature, etc.