The performance evaluation of autonomous navigation systems plays an important role in engineering applications, but there are few researches on the general capability evaluation of autonomous navigation systems. To solve this problem, this paper proposes a general capability evaluation method of autonomous navigation system based on similarity calculation, which aims to effectively measure the performance of autonomous navigation system in complex environment. This method provides a scientific decision basis for the design optimization and decision support of autonomous navigation systems, and plays an important role in improving the general capability of autonomous navigation systems and coping with diversified task challenges.