Abstract: A superresolution direction finding algorithm for arbitrary channel number condition is proposed. Switching to measure the covariance matrix by multiplex switch, and then reconstructs the array steering vector, to achieve superresolution direction finding. The current algorithm can only be used for the channel number which is equal to 1 or the number of antenna array elements. The new algorithm overcomes the limitation, expanding the scope of application of the super resolution direction finding algorithm. The algorithm is deduced in detail. The results of computer simulation show that this algorithm is better than the single channel algorithm, close to the classical algorithm for direction finding.