Manifold　microchannel　heat　sinks　(MMCHSs)　are　essential　in　thermal　management.　Conventional　Z-type　MMCHS　encounter　flow　maldistribution　and　large　temperature　gradients　on　the　heating　surface.　This　work　proposes　an　innovative　MMCHS　with　restrictors　to　reduce　flow　maldistribution　and　compared　with　other　optimization　schemes.　Through　the　numerical　simulation,　we　optimize　three　dimensionless　parameters　(the　width　ratio　α　and　length　ratio　β　of　the　restrictor　and　inlet-to-outlet　width　ratio　of　manifold　γ).　Introducing　the　restrictor　into　the　MMCHS　can　reduce　flow　maldistribution.　In　the　research　scope,　the　maximum　mass　flux　discrepancy　of　MMCHS　with　α　=　0.3　decreased　from　327.17%　to　64.51%　compared　to　MMCHS　with　α　=　1　when　the　volumetric　flow　rate　is　8.51　mL/min.　The　reason　is　that　restrictors　increase　the　ratio　between　pressure　drop　in　microchannels　and　total　pressure　drop(Δpc/Δp).　Additionally,　the　coupling　effect　of　the　restrictor　and　γ　on　thermal-hydraulic　in　MMCHS　are　complicated.　Therefore,　the　thermal　resistance　ratio　(Rt/Rt,0),　the　pumping　power　ratio　(Pp/Pp,0)　and　performance　evaluation　criteria　(PEC)　are　taken　as　references　to　consider　the　thermal-hydraulic　performance　of　MMCHS　comprehensively.　The　results　display　that　the　MMCHS　with　α　=　0.5–　0.6,　β　=　0.4　and　γ　=　0.8–　1　can　further　control　the　synchronization　of　Rt/Rt,0　and　Pp/Pp,0　at　about　0.75.　The　PEC　values　are　all　greater　than　1.59.　©　2023