In the actual direction finding system, due to the inconsistency of the transmission characteristics of the radio frequency parts such as multi-channel microwave components, antenna elements and connecting cables, the mismatch of the receiving channels is inevitable. When there is channel mismatch, the received data of the antenna array contains amplitude and phase errors, which eventually lead to a sharp decline or even failure of the estimation performance of the direction of arrival (DOA) of the spatial spectrum. Aiming at this problem, a channel correction algorithm based on a single auxiliary source is used to study the application of this algorithm in channel data pre-compensation and steering vector correction, and combines the multiple signal classification algorithm (MUSIC) for DOA estimation. The effectiveness of the correction algorithm is verified by the simulation parameters such as signal-to-noise ratio, number of snapshots and root mean square error. The measured data of the hardware platform is used to verify that the correction algorithm can effectively compensate for channel mismatch and obtain high DOA estimation performance.