A transmitting sonde for acoustic logging is proposed, which can realize downhole azimuthal measurement. The phased arc array and the linear phased array are combined to form a combined phased arc array. We can take advantage of the directivity characteristics of the phased arc array and linear phased array. The horizontal directivity can be adjusted by controlling the excitation phase of each element in the arc array, and the vertical directivity can be adjusted by controlling the excitation phase between adjacent arc array loops on the axis, At the same time, the intensity of useful signals radiated by sound sources is increased. The working principle of the combined phased arc array is analyzed, and the structure of the acoustic sonde is put forward. The transmitting electronic circuits are integrated with the transmitting transducer array in the acoustic sonde, and an active transmitting module is formed. The excitation electronic system generates high voltage pulses, the excitation pulse width and delay of each transducer element can be precisely controlled, and the vibration polarity can also be easily changed. Laboratory tests show that the ratio of the peak-to-peak value of the sound pressure of single array element, phased array, and combined phased arc array is approximately 1: 2.22: 8.34, which indicates that the sound pressure peak value of the transmitting sonde is obviously increased. The 3 dB angle width of the main lobe of the sound beam is between 54 and 60° in the horizontal plane, and it has a better azimuthal resolution. In the vertical plane, the main lobe of the sound beam is deflected under the control of the phase delay time, the 3 dB angle width of the sound beam is about 13°, and the radiation beam in the axial direction has a good focusing effect. Field tests show that the sonde can predict the circumferential anisotropy of the borehole formation.