With　the　coexistence　shared　autonomous　vehicles(SAVs)　and　traditional　vehicles,　this　paper　studies　how　the　SAV　company　optimizes　its　operating　strategies　with　regards　to　different　operational　objectives　and　the　influences　on　the　commuters＇　travel　mode　choices.　Provided　that　a　certain　number　of　solo　commuters　drive　the　traditional　vehicles　on　the　highway,　and　the　other　commuters　without　a　car　make　travel　mode　choices　between　SAV　and　transit.　This　paper　optimizes　the　operating　strategies　(i.e.,　the　fare　and　capacity　for　SAVs)　with　the　objectives　changing　from　the　total　system　cost　or　the　net　system　benefit　to　the　profit　of　the　SAV　company　under　the　fixed　demand　and　the　elastic　demand,　respectively.　The　equilibrium　mode-split　flow,　the　optimal　number　of　SAVs,　the　total　system　cost　or　the　net　system　benefit,　the　profit　for　the　company　for　SAVs,　and　other　indicators　are　obtained.　The　equilibrium　results　are　verified　by　a　numerical　example,　and　it　is　found　that　the　monopoly　SAV　company　always　charges　a　higher　fare　and　provides　a　smaller　capacity.　At　the　state　of　system　optimum,　the　company　for　SAVs　can＇t　produce　the　positive　profit　and　can　only　operate　with　the　subsidy　from　the　government.　Copyright　©　2020　by　Science　Press.