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We demonstrate laser ultrasonic generation in polyetheretherketone (PEEK).A middle infrared ZnGeP2 optical parametric oscillator (ZGP-OPO) pumped by a Q-switched Ho∶YAG laser is employed as the ultrasonic excitation source.The ZGP-OPO has a spectral range of 3.2-3.4μm.At an output wavelength of 3.4μm,the maximum average output power of ZGP-OPO is 3.05 W with a pulse width of 24.3ns,corresponding to a peak power of approximately 127.5kW.The ultrasound is generated by the laser converted from 3.2 to 3.4μm in the PEEK composite.The maximum ultrasonic signal amplitude in PEEK is 33 m V under the condition of thermoelastic excitation at 3.4 μm.Ablation occurs in the CPRF sample when the energy fluence is over 122.45 mJ/cm2.PEEK has a stronger absorption at 3.4 μm and laser-ultrasound generation is influenced by the wavelength of the laser.