The　dispersive　Fourier　transform　technique　provides　feasibility　of　exploring　non-repetitive　events　and　the　buildup　process　in　ultrafast　lasers.　In　this　paper,　we　report　a　new　buildup　process　of　dissipative　solitons　in　a　simplified　mode-locked　Yb-doped　fiber　laser,　which　includes　more　complex　physics　stages　such　as　the　Q-　switching　stage,　raised　and　damped　relaxation　oscillation　stages,　noise-like　stage,　successive　soliton　explosions　stage,　and　soliton　breathing　stage.　Complete　evolution　dynamics　of　noise-like　pulse　and　double　pulse　are　also　investigated　with　dispersive　Fourier　transform.　For　the　noise-like　pulse　dynamics　process,　it　will　only　experience　the　Q-　switching　and　relaxation　oscillation　stages.　In　the　case　of　dissipative　soliton　and　noise-like　pulse,　the　double　pulse　buildup　behavior　is　manifested　as　the　replication　of　individual　pulses.　A　weak　energy　migration　occurs　between　two　pulses　before　reaching　steady　state.　Meanwhile,　real-time　mutual　conversion　of　the　dissipative　soliton　and　noise-like　pulse　has　been　experimentally　observed,　which　appears　to　be　instantaneous　without　extra　physical　processes.　To　the　best　of　our　knowledge,　this　is　the　first　report　on　these　physical　phenomena　observed　together　in　a　mode-locked　fiber　laser.　The　results　further　enrich　the　dynamics　of　mode-locked　fiber　lasers　and　provide　potential　conditions　for　obtaining　intelligent　mode-locked　lasers　with　controllable　output.