In order to compress the bandwidth of laser-induced acoustic signals,a method of generation of narrow-band signals with high-repetition rate pulsed laser is presented based on the theory of thermoelastic mechanism.The optimum repetition rate is calculated to produce acoustic signals with effective narrow-band,and the experimental results validate this method.Comparisons of performance based on the power spectral density at center frequency are made between the high repetition rate method and the long pulse method.The results show that the narrow-band acoustic signal is the most effective at the optimum repetition rate,which is determined by the optical wavelength,the radius of laser beam,and the observation angle.The method with high repetition rate is better than that with long pulse when the pulse number exceeds 10.The power spectral density of the method with high repetition rate is 9.3 dB higher than that of the long pulse method when the pulse number is 100.