Abstract: In order to effectively detect the anchorage quality in various engineering practice, the article studied the propagation law of the high-frequency ultrasonic guided wave in free rock bolts and anchor bolt by theoretical analysis and laboratory testing, the study scaned the test specimen of different anchoring quality when the excitation frequency was from 2.25 to 15 MHz and drew curves of peak ratio with gain, the experimental results and theoretical attenuation dispersion curves was coincidence. The results showed that the same frequency peak ratio hardly varies with gain variation in a certain frequency range, and high frequency of more than 7.5 MHz guided wave is not suitable to make a preliminary study for bolt anchoring quality testing.