We　numerically　demonstrated　six　types　of　pulses　in　an　Yb-doped　fiber　laser,　including　dissipative　soliton　(DS),　dissipative　soliton　resonance　(DSR),　multipulse,　noise-like　pulse　(NLP),　breathing　soliton　and　soliton　explosion.　The　influence　of　cavity　conditions　on　DSR　pulse　properties　is　discussed　systematically.　It　is　found　that　the　change　of　the　saturation　power　of　saturable　absorber　(SA)　could　transform　DSR　into　various　types　of　pulses.　Saturation　power　of　SA　and　injected　signal　affect　the　number　and　shape　of　multipulse.　Furthermore,　the　influence　of　the　saturation　power　of　SA　and　intra-cavity　dispersion　on　pulse　type　is　diagrammed　intuitively.　By　properly　adjusting　the　transmission　curve　of　SA,　breathing　soliton　and　soliton　explosion　can　be　obtained　as　well.