Abstract: The performance of array antenna with a large number of elements is affected by the emerging failure elements, and the performance restoration can be achieved by the evolution of the remaining normal elements through evolutionary reconfiguration. The array antennas' evolutionary reconfiguration is analyzed. The fitness function types in self-repair process are analyzed. The evaluation process of different fitness functions is designed. Through the self-repair simulation experiment of a Chebyshev linear array, the self-repair results of array antennas with different fitness functions are analyzed. The analysis result shows that the fitness function based on performance parameters and the combination of pattern matching and performance parameters have better performance. The analysis result provides a reference for the fitness function selection in array antenna self-repair.