FRPs (fiber reinforced plastics) have been used widely for there excellent characteristic. Due to their anisotropy and non-homogeneity, drilling FRPs cause some problems such as fiber breakage, matrix cracking, fiber pull-out, spalling and delamination etc. Those problems not only reduce the structural integrity, but also have the possibility of deteriorating the long-term performance. In this paper, the critical thrust and the thrust force during the vibration drilling FRPs with hybrid variation parameters which could improve holes integrity of FRPS were investigated. From the drilling experiments, it was proved that high quality holes could be obtained and holes integrity can be improved by this new drilling method.
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