in the last couple of years, ultrasonic meter a device has established and considered the fastest-growing new technologies in the oil and gas fields. The Orifice plate problems are very uncertainty and very high cost in maintained. The Ultrasonic Meters (USMs) have improved in the petroleum career because they provide substantial value to the clients by dropping the cost of doing the commercial. More applications are existence planned today using this technology. The main objectives of the proposing USMs used in Alexandria City (IDKU Site Plant) are to measure gas flow rate in Gas filed which have more benefits over the orifice plate in reducing measurement uncertainty to achieve the high accuracy before export to the domestic grid. The aim of this paper is to compare between USM and Orifice plate via simulation and experimental results.