Based on the foreign objects damage data of civil aviation engine fan blades in recent 20 years

the most typical features of hard object impact damage were filtered

and the fan blade damage characteristics were classified according to the engine maintenance manual. Then the relevance and differences between the damage types and engine types

the damage position features

and damage size features were analyzed. The results indicate that the damage type of engine fan blades hard object impact has diversified characteristics

in which the occurrence probability of two damage types (notch and dent) is larger

and there are some differences in specific engine type of different damage types. The analysis of the damage position and size features shows that there is a certain cluster statistical law of the fan blades damage position

and the damage size characteristic presents a certain statistical distribution. The results are able to provide technical reference for the actual maintenance of aero engine fan blades.