Taking　advantage　of　the　technology　of　dispersive　Fourier　transform　(DFT),　we　experimentally　observed　the　evolutionary　dynamics　of　convention　solitons(CSs)　in　a　simplified　Erbium-doped　fiber　laser.　The　periodic　beating　behavior　that　occurs　during　the　build-up　and　disappearance　of　conventional　solitons　was　discovered　in　a　nonlinear　polarization　rotation　(NPR)　fiber　lasers.　We　suggest　the　reasonable　assumption　that　the　periodic　beating　during　the　dynamic　evolution　may　be　a　close　connection　with　the　modulation　depth　of　the　intracavity　saturable　absorber　The　results　of　this　study　can　deepen　researchers＇　understanding　of　the　evolution　of　CSs　and　provide　additional　judgment　dimensions　for　optimizing　the　laser　parameters.　©　2022　SPIE.