Three-dimensional　laser　scanning　technology　has　been　more　mature,　and　its　application　fields　are　expanding.　It　is　being　used　in　key　projects　and　important　work　such　as　ancient　building　recording,　restoration　and　reconstruction.　In　this　paper,　the　technology　is　applied　to　the　3D　scanning,　data　splicing　and　model　simplification　of　Heping　temple　building　complex　in　Beijing.　After　innovative　research　on　ancient　architecture,　it　is　found　that　the　group　layout,　single　form　and　local　components　of　Heping　temple　building　complex　in　Beijing　show　symmetry　everywhere,　vividly　reflecting　the　extensive　and　profound　ancient　architectural　culture　and　order.　This　points　out　a　new　direction　for　the　development　and　application　of　3D　laser　scanning　technology　and　opens　up　a　new　path　for　the　in-depth　study　of　the　protection　of　ancient　buildings　in　China.