Array antennas consisting of a large number of array elements are widely used in modern radar equipment.In actual application,the array antennas are constantly experiencing failed elements.The failure probability of array elements of different numbers in array antennas of different sizes is analyzed,and the performance analysis process of array antennas under different combination modes of failure elements is designed.Taking the Chebyshev linear array and the Taylor linear array of different scales as examples,the relationship of maximum sidelobe level,average sidelobe level,half-power beamwidth,first nulls beamwidth,directivity coefficient of the array antenna with the failed elements amplitude and position is analyzed.The analysis results provide a basis for self-repairing of array antennas with failed array elements.