In order to study the detection and identification technology of foreign object impact on fan blade at noninterference blade tip vibration measurement, a fan blade test platform for detection and identification of foreign object impact is designed and built. Lots of experiments are carried out under different working conditions such as projectile mass、launching speed and fan speed. The criterion of foreign object impact identification is preliminarily given before the identification results are verified at high speed camera. The difference of the recognition accuracy under different projectile mass and rotating speed conditions, and qualitative rule between impact factors and blade tip vibration is analyzed. The result shows that the detection and identification system could accurately determine the impact event with the number of impact blade. The identification accuracy of the system reaches 100% under conditions of fan speed within the range of 1800~4000 r/min, and the mass of the projectile is greater than 2.90 g. The above mentioned provides important test data and basis for establishing intelligent detection and identification methods for foreign object impact.