In　the　upcoming　video　coding　standard　VVC　(Versatile　Video　Coding,　H.266),　a　new　coding　block　structure　named　quadtree　nested　multi-type　trees　(MTT)　has　been　proposed.　Compared　with　the　quadtree　structure　defined　in　HEVC　(High　Efficiency　Video　Coding),　the　partition　structure　of　MTT　can　achieve　better　coding　performance.　Since　the　splitting　scheme　of　a　CU　(Coding　Unit)　need　to　be　calculated　recursively,　the　computational　complexity　is　significantly　increased.　To　reduce　computational　complexity　as　well　as　maintain　compression　performance,　a　fast　multi-type　tree　decision　algorithm　is　proposed.　The　application　of　binary　and　ternary　tree　in　horizontal　or　vertical　direction　is　found　to　be　closely　related　to　the　characteristics　of　CU　in　this　paper,　and　a　metric　named　pixel　difference　of　sub-blocks　(SBPD)　is　defined　to　measure　the　characteristics　of　CU　in　different　splitting　type.　By　comparing　the　SBPD　in　horizontal　and　vertical　sub-blocks,　the　selection　of　binary　and　ternary　tree　can　be　decided　in　advance,　so　as　to　skip　some　redundant　splitting　modes.　Experimental　results　show　that　compared　with　the　original　reference　software　VTM　4.0,　the　average　time　saving　of　the　proposed　algorithm　is　27%　and　the　BD-rate　is　only　increased　by　0.55%.　©　2020　The　Institute　of　Electronics.