The string vibration experiment can be used as a basis to not only study the amplitude change of the wave during forced vibration,but also the phase change of the wave,especially the phase of wave at resonance.In this paper,the differential equation was established to research the amplitude and phase of forced string vibration by using a simplified model of string vibration.The res-onance frequency of string was measured by resonance method and phase method,and then the linear density of string was calculated.The experimental values measured by the two methods were in good agreement with the theoretical values.This experiment could not only expand the string vibration ex-periment,but also further deepen the students'understanding of resonance phenomenon.
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