Hitherto,　Versatile　Video　Coding　(VVC)　has　a　more　magnificent　overall　performance　than　High　Efficiency　Video　Coding　(HEVC).　The　Quadtree　with　Nested　Multi-Type　Tree　(QTMT)　coding　block　structure　can　substantially　enhance　video　coding　quality　in　VVC.　However,　the　coding　gain　also　leads　to　a　greater　coding　complexity.　Therefore,　this　letter　proposes　a　Fast　Decision　Scheme　Based　on　Structural　Similarity　Index　Metric　Variation　(FDS-SSIMV)　to　solve　this　problem.　Firstly,　the　Structural　Similarity　Index　Metric　Variation　(SSIMV)　characteristic　among　the　sub　coding　units　of　the　spit　mode　is　illustrated.　Next,　to　evaluate　the　SSIMV　value,　SSIMV　measure　strategies　are　designed　for　different　split　modes　in　this　letter.　Then,　the　desired　split　modes　are　selected　by　the　SSIMV　values.　Experimental　results　show　that　the　proposed　method　achieves　an　average　encoding　Time　Saving　(TS)　and　Bjontegaard　Delta　Bit　Rate　(BDBR)　with　64.74%　and　2.79%,　respectively,　outperforming　the　benchmarks.