The　control　of　d　precipitations　is　important　during　the　thermal　processing　of　Inconel　718　superalloy　(IN718)　because　it　can　control　the　grain　size　and　affect　the　mechanical　properties　of　the　material.　The　main　purpose　of　this　study　was　the　effects　of　plastic　deformation　and　Grain　Boundary　Misorientation　(GBMO)　on　d　phase　precipitation　at　grain　boundaries　(GBs).　The　content　of　the　d　phase　and　the　number　of　precipitated　orientations　at　the　GB　were　statistically　analyzed.　It　was　found　that　the　d　phase　grew　into　grains　along　the　{111}　plane　of　?-matrix　after　nucleation　at　the　GB.　Plastic　deformation　can　change　the　morphology　and　precipitate　location　of　d　phase,　with　the　increasing　of　plastic　strain,　the　content　of　the　d　phase　and　the　number　of　precipitated　orientations　in　GBs　increased,　which　was　related　to　the　piling　up　of　dislocations　caused　by　deformation　and　the　slip　of　{111}　plane.　For　the　undeformed　samples,　the　d　phase　precipitation　at　the　GB　was　affected　by　the　GBMO,　which　was　consistent　with　the　change　of　GBs　energy　with　the　GBMO.　The　influence　of　the　structure　and　characteristics　of　the　interfaces　(GBs　and　twin　boundaries)　on　the　precipitation　behavior　of　the　d　phase　is　also　analyzed　in　this　study.