From　the　perspective　of　crystallography,　there　exist　crystals　as　well　as　boundary　planes　in　NdFeB　permanent　magnets　and　accordingly,　there　should　exist　orientation　textures　of　Nd2Fe14B　crystals　and　orientation　texture　of　boundary　planes.　This　work　therefore　aims　to　study　the　misorientations　across　boundary　planes　in　a　sintered　NdFeB　permanent　magnet.　As　an　interdisciplinary　study,　serial　stereological　methods　are　developed　to　extract　more　structural　information　from　the　material　and　as　the　result,　spreading　wetting　and　penetration　of　Nd-Rich　phases　to　the　Nd2Fe14B　phase　are　quantificationally　characterized.　The　entire　boundaries　are　sorted　into　Nd2Fe14B/Nd2Fe14B　grain　boundaries　(N/N　boundaries)　and　Nd2Fe14B/(thin-layer-like)Nd-Rich　phase　boundaries　(N/R　boundaries).　31　degrees/[0　0　1]　and　60　degrees/[0　0　1]　twist　boundaries　are　preferred　among　N/N　boundaries,　while　31　degrees/[0　0　1]　and　72　degrees/[0　0　1]　misorientations　are　preferred　among　N/R　boundaries.　The　structural　features　of　these　misorientations　are　elaborated　via　the　Five　Parameter　Analysis　(FPA)　method.　The　potential　correlations　between　the　grain　boundary　plane　distributions　(GBPDs)　and　magnetic　properties　are　then　discussed　regarding　how　the　anisotropic　features　at　boundary　locations　impact　coercivity,　domain　and　remanence.