In　engineering　application,　the　saturation　voltage　drop　(V-CE)　method　is　widely　used　for　junction　temperature　prediction.　However,　it　is　difficult　to　characterize　the　peak　temperature　by　the　virtual　junction　temperature　measured　by　the　V-CE　method.　In　this　article,　the　reasons　why　the　virtual　junction　temperature　is　lower　than　the　peak　junction　temperature　were　explained　by　analyzing　the　internal　current　distributions　of　the　module　for　different　temperature　distributions.　Using　an　equivalent　model　composed　of　discrete　devices,　the　virtual　junction　temperatures　for　different　temperature　distributions　and　measuring　currents　were　measured.　The　current-weighted　temperatures　for　different　measuring　currents　were　also　calculated　using　the　branch　current.　The　virtual　junction　temperature　and　current-weighted　temperature　were　compared　and　investigated　in　combination　with　simulation　results　under　ideal　conditions.　The　variation　law　of　the　virtual　junction　temperature　with　the　sense　current　and　the　temperature　distribution　was　determined,　which　will　aid　in　the　measurement　of　the　junction　temperature　in　engineering.