The experimental system of string vibration based on magnetoelectrie exeitation was employed tosystematieally invesligate the factors infueneing the resonant frequeney and wave velocity of standing wavesusing the controlled variable method.The experimental results show that the resonant frequeney isapproximately equal to the eigenfrequeney, with higher hamonie frequeney being integer multiples of thefundamental frequeney.'The resonant frequeney is proportional to the number of antinodes and the square root oftension , while inversely proportional to the string length and the square root of string density,The wave velocityis determined solely by tension and string density,This study not only verilfies the correctness of the theoretiealmodel of standing waves but also elleetively enhanees students "experimental skills and seientifie inquiryabilities.