Production　line　simulation　is　a　prerequisite　to　ensure　the　correctness,　rationality　and　effectiveness　of　a　plan　of　the　production　design,　and　the　simulation　of　the　correctness　of　the　production　line　logic　is　the　most　critical.　To　realize　the　production　line　simulation　technology　based　on　the　digital　twin,　a　method　of　digital　twin　logic　model　construction　oriented　to　the　production　line　simulation　was　proposed.　First　of　all,　the　composition　architecture　of　the　production　line　simulation　system　was　proposed.　Then,　the　construction　method　of　the　digital　twin　logical　model　was　explained　from　the　four　dimensions　of　geometry,　physics,　production　behavior,　and　simulation　rules.　The　definition　methods　of　geometric　attributes　and　physical　attributes　were　introduced　in　detail,　and　the　production　behavior　was　defined　by　finite　state　machine　and　three　types　of　simulation　rules,　which　include　messaging　rules,　synchronous　advance　rules　and　mutual　exclusion　priority　rules.　The　production　line　logic　simulation　prototype　system　was　developed　based　on　the　method　of　model　construction　finally,　and　the　effectiveness　of　the　modeling　method　was　verified　through　the　simulation　of　the　production　line　example.　©　2022,　Editorial　Department　of　CIMS.　All　right　reserved.