In　this　work,　we　use　computational　fluid　dynamics　(CFD)　models　to　compare　the　advantages　and　disadvantages　of　various　door　geometries　by　looking　at　how　open　doors　of　four　different　door　geometries　affect　the　stability　of　the　temperature　inside　a　refrigerated　vehicle　during　unloading.　The　results　show　that,　with　opening　D1　and　D2,　D3　and　D4,　D1,　D4,　the　temperature　increases　from　4　degrees　C　to　22.34,　22.65,　20.39,　and　21.32　degrees　C　after　4　min,　respectively.　The　coefficients　of　temperature　variation　are　.009,　.011,　.015,　and　.014,　respectively.　The　volume　infiltration　flow　rates　are　2.202,　2.189,　0.983,　and　0.961　m(3)/s,　respectively.　Comparing　the　coefficients　shows　that　opening　the　D1D2　doors　does　not　significantly　perturb　the　temperature　of　the　carriage,　and　opening　the　D1　door　modifies　the　temperature　less　than　opening　the　D4　door.　The　maximum　root-mean-square　error　for　volume　mean　temperature　and　wind　speed　is　1.21　degrees　C　and　0.27　m/s,　respectively.　Practical　applications　In　urban　cold-chain　delivery　and　distribution,　the　main　solution　to　maintain　temperature　stability　on　opening　the　doors　is　to　limit　the　number　of　doors　and　their　area　relative　to　the　volume　of　the　refrigerated　vehicle.　As　a　result,　it　is　very　important　to　optimize　the　structural　design　of　refrigerated　vehicles　to　reduce　energy　consumption,　enhance　temperature　stability　inside　the　refrigerated　compartment,　and　ensure　the　quality　and　safety　of　the　perishable　food　stored　within.　In　this　study,　the　evaluation　index　is　used　with　CFD　technology　to　study　how　open　doors　of　various　sizes　and　at　different　locations　affect　the　temperature　inside　the　refrigerated　vehicle.　This　research　provides　not　only　a　more　detailed　understanding　of　flow　distribution　and　temperature　variations　inside　the　carriage　while　opening　the　door　of　a　refrigerated　compartment　but　also　a　reliable　theoretical　basis　for　optimizing　the　design　of　refrigerated　vehicles.