For　methanol/diesel　dual-fuel　combustion,　there　are　two　different　methanol　injection　implementations:　port　injection　into　the　intake　manifold　and　direct　injection　into　cylinder.　In　this　work,　an　experimental　comparison　was　conducted　for　the　two　methanol　injection　strategies　to　study　the　effects　of　the　methanol-energy-substation　ratio　(ESR)　and　diesel　injection　timing　on　the　fuel-air　mixing　and　combustion　characteristics.　The　results　showed　that　the　ignition　delay　was　increased　with　ESR　due　to　the　cooling　effect　of　methanol　evaporation　in　the　cylinder.　The　combustion　duration　under　methanol　direct　injection　condition　was　much　shorter　than　that　of　the　methanol　port　injection　strategy.　The　methanol　direct　injection　strategy　had　a　more　controllable　and　stable　heat　release　than　that　of　methanol　port　injection　strategy.　The　maximum　ESR　could　reach　up　to　96.0%　in　the　methanol　direct　injection　strategy.　The　methanol　direct　injection　strategy　had　a　better　fuel　economy,　and　its　maximum　indicated　thermal　efficiency　could　reach　up　to　41.55%　at　50%　ESR.　The　methanol　direct　injection　strategy　yielded　higher　NOx　emissions　than　that　with　the　port　injection　strategy,　accompanied　by　a　mild　increase　of　soot　emissions.　Compared　with　methanol　port　injection,　the　methanol　direct　injection　strategy　exhibits　lower　CO　emissions,　however,　it　suffers　from　higher　HC　emissions.　©　2022　Elsevier　B.V.