Abstract: The detection and tracking of low, slow and small targets is a difficult problem in the field of radar. When a circular array radar tracks unmanned aerial vehicle targets with variable speeds, it often leads to tracking instability and breakage due to the problem of energy diffusion during accumulation. In this paper, the adaptive data rate tracking potential of circular array radar is fully exploited, the target signal-to-noise ratio is introduced into the tracking loop, and the long-term coherent accumulation pulses are used as the remedial tracking beam to ensure stable tracking in the target maneuvering section. At the same time, the range migration and Doppler diffusion caused by long-term irradiation are corrected by Keystone transform and Dechirp algorithm. Numerical simulation and experimental results based on circular array radar show that the proposed method is effective.