The high-performanced TI F2812 DSP processor is applied to design an ultrasonic flowmeter with simple structure.The flowmeter consists of a novel equilateral triangle shape with one ultrasonic transmitter and two receiving detectors,which can measure the transmission time at two directions simultaneously,thus avoid the error brought by asynchronous measurement.With an embedded keyboard and a 12864 displayer,the whole flowmeter is small in size and easy to handle.The hardware design is given in detail in the paper.Experimental results show that the presented flowmeter is feasible in fluid detection.