Over the last decade, ultrasonic flowmeters have made measurable penetration in the flowmeters field, although the principles of the ultrasonic flow measurement have been known for a long time. This kind of flowmeters have numerous inner adventages over most of the traditional methods. In this paper, e review of the usable ultrasonic flow measuring methods for industrial purpose from the practical aspect in its realisation is presented. it is also shown that the pulse--phase bidirectionality ultrasonic flowmeter integrated in a microprocessor--based electronics package can achieve very good performances.