Abstract: At present, the volume of phased array Doppler log has been reduced a lot compared with the piston type Doppler log. The former can simply transmit and receive signal by a transceiver planar array, and can form multibeams in four directions at the same time, so it can greatly reduce the size of the array and eliminate the influence of sound velocity change on speed measurement. However, the volume of transducer array in medium-depth and large-depth Doppler logging equipment still limits the type of suitable carrier. Taking the miniaturization of Doppler log as the core, in this paper the beamforming technology for the element densely arranged phased array of Doppler log is analyzed, and the integrated and miniaturized Doppler log is developed. The transmitting directivity, sound source level, sensitivity and system complexity of the element densely arranged phased-array are compared with the traditional phased-array. Analyses show that under the same frequency, same transmitting power and same size, the joint response of the transceiver of element densely arranged phased-array is improved by nearly 6 dB compared to the traditional phased array, and in the same range of speed measurement, this technology can reduce the element number of transducer array, so as to decrease the size of the transducer and achieve the purpose of miniaturization.