Titanium　dioxide　(TiO2)　nanocrystals　have　attracted　great　attention　in　heterogeneous　photocatalysis　and　photoelectricity　fields　for　decades.　However,　contradicting　conclusions　on　the　crystallographic　orientation　and　exposed　facets　of　TiO2　nanocrystals　frequently　appear　in　the　literature.　Herein,　using　anatase　TiO2　nanocrystals　with　highly　exposed　{001}　facets　as　a　model,　the　misleading　conclusions　that　exist　on　anatase　nanocrystals　are　clarified.　Although　TiO2-001　nanocrystals　are　recognized　to　be　dominated　by　{001}　facets,　in　fact,　anatase　nanocrystals　with　both　dominant　{001}　and　{111}　facets　always　co-exist　due　to　the　similarities　in　the　lattice　fringes　and　intersection　angles　between　the　two　types　of　facets　(0.38　nm　and　90　degrees　in　the　[001]　direction,　0.35　nm　and　82　degrees　in　the　[111]　direction).　A　paradigm　for　determining　the　crystallographic　orientation　and　exposed　facets　based　on　transmission　electron　microscopy　(TEM)　analysis,　which　provides　a　universal　methodology　to　nanomaterials　for　determining　the　orientation　and　exposed　facets,　is　also　given.