Recent　advances　in　experimental　techniques　allow　one　to　create　a　quantum　point　contact　between　two　Fermi　superfluids　in　cold　atomic　gases　with　a　tunable　transmission　coefficient.　In　this　Rapid　Communication　we　propose　that　three　distinct　behaviors　of　charge　transports　between　two　Fermi　superfluids　can　be　realized　in　this　single　setup,　which　are　the　multiple　Andreev　reflection,　the　self-trapping,　and　the　Josephson　oscillation.　We　investigate　the　dynamics　of　atom　number　difference　between　two　reservoirs　for　different　initial　conditions　and　different　transmission　coefficients,　and　present　a　coherent　picture　of　how　the　crossover　between　different　regimes　takes　place.　Our　results　can　now　be　directly　verified　in　the　current　experimental　system.