In　order　to　measure　the　transmission　error　of　bevel　gear　pair,　a　measurement　method　of　transmission　error　based　on　the　best　mounting　distance　was　introduced.　The　algorithm　of　adjustment　of　the　best　mounting　distance　was　presented,　and　the　single　flank　testing　of　bevel　gear　pair　was　carried　out　on　this　position.　The　evaluation　of　transmission　error　and　frequency　spectrum　was　described.　Measurement　and　control　software　was　developed　including　the　function　of　data　acquisition　and　processing　and　graphic　display,　optimizing　search　of　best　mounting　distance　and　SPC　statistical　analysis.　The　class　diagram,　the　sequence　diagram,　the　test　case　diagram　and　the　main　interface　of　the　software　was　designed.　The　experiment　was　carried　out　that　the　mounting　distance　on　130.0mm　of　pinion　is　the　best　mounting　distance　according　to　the　value　of　the　factor　F　0.699.　Under　the　best　mounting　distance,　the　total　tangential　composite　deviation　is　79.27μm.　The　method　and　the　software　mentioned　in　this　paper　can　be　used　in　measurement　of　the　bevel　gear　pair　or　the　face　gear　pair.　©　2017　ASME.