Abstract: Based on the near-field array theoretical model, the effect of channel error and sensor position error on the signal's spatial filtering performance is studied. Firstly, based on the near-field attenna array signal model, two kinds of errors are modeled, and the theoretical upper bounds of the first-order and second-order statistics of the output beam difference are derived from a statistical point of view. Then, Monte Carlo experimental curve and theoretical upper limit curve are given and compared. The simulation results of the beam with error feasibility of the theoretical upper limit, showing a certain guiding significance for engineering applications.