A　review　on　the　crystal　structures　of　ring-substituted　plithalocyanines　(Pc　or　Pcs)　reported　in　literature　so　far　in　connection　with　those　solved　by　our　research　group　is　given　in　this　paper.　For　the　convenience　of　description,　the　30　crystal　structures　are　divided　according　to　their　substitution　types　into　tetra-,　octa-,　hexadeca-,　non-equivalent　and　inner-ring-substituted　configurations.　In　the　tetra-substituted　Pcs,　the　planar　configuration　of　Pc　ring　system　is　maintained,　and　the　Pc　rings　are　pushed　mutually　by　the　introduced　substituents,　leading　to　a　series　of　structural　caves　to　allow　the　insertion　of　solvent　molecules,　as　found　in　compound　3.　In　the　octa-substituted　Pcs,　space　hindrance　may　exist　between　the　substituents　of　neighboring　iso-indolenes,　and　it　can　be　relaxed　either　by　changing　the　orientation　of　substituents　or　by　the　saddle　deformation　of　the　Pc　rings.　Both　two　possible　structural　variants　are　found　in　different　compounds.　I　For　hexadeca-substituted　Pcs,　four　compounds　listed　in　Table　3　are　reported.　It　is　interesting　to　note　that　compound　22　has　a　special　catalytic　activity　which　can　couple　phosphanes　with　acetone　to　produce　ylides　and　water　at　ambient　condition,　as　shown　in　the　following　formula　PPh3　+　CH3C(=O)CH3　+　1/2O(2)　--＞　Ph3P=CHC(=O)CH3　Concerning　the　non-equivalent　substituted　Pc,　only　one　compound　with　formula　1,4-(C4H9O)(2)-2,3(Py)2-8,11,15,18,22,25-(C6H13)(6)PCZn　has　been　reported　so　far.　In　this　structure,　three　isoindolenes　are　substituted　by　two　hexyl　groups,　and　the　other　one　by　two　pyridyl　and　two　butoxy　groups,　so　that　it　is　a　ten　substituted　compound　in　fact.　Not　only　can　the　16　ring　H　atoms　be　substituted　by　other　groups　or　atoms,　but　also　the　carbon　atoms　at　the　inner　ring　can　be　combined　with　suitable　groups　or　atoms.　The　compounds　with　formulas　{(CH3O)(2)Pc}NiCH3OH　and　{(CH3CH2O)(2)}Ni　belong　to　this　type,　in　which　the　connection　of　inner　ring　carbons　with　substituents　leads　to　the　saddle　distortion　of　the　ring　systems.　In　addition,　the　so-called　＂bicyclic＂　type　compound　can　also　be　included　in　this　respect.　At　the　end　of　this　paper　a　prospect　has　been　made　that　the　development　of　this　area　is　going　to　open　a　new　branch　of　supramolecules　based　on　the　phthalocyanine　planar　skeleton.