In　this　study,　parallelogram-like　macrocyclic　supramolecular　metallacycles　[Pd-6(bpy)(6)(L-1)(4)](PF6)(8)　(1a)　and　[Pd-6(bpy)(6)(L-2)(4)](PF6)(8)　(2a),　where　HL1=1-(1H-pyrazole-4-yl)-4-(4-pyridyl)benzene,　HL2=9-(1H-pyrazole-4-yl)-10-(4-pyridyl)anthracene,and　bpy=2,2＇-bipyridine,　are　synthesized　by　reacting　aryl　pyrazole　pyridine　ligands　with　dipalladium　corners　in　aqueous　solutions　via　metal-directed　hierarchical　self-assembly.　The　structures　of　the　supramolecular　Pd　parallelograms　are　confirmed　through　single-crystal　X-ray　diffraction.　Notably,　the　two　parallelogram　metallacycles　can　be　used　as＂turn-on＂fluorescence　sensors　to　detect　HSO3-　through　a　disassembly　mechanism.　In　addition,　the　1a-based　sensor　shows　selective　detection　of　HSO3-　without　interference　from　other　anions.　The　detection　limit　was　as　low　as　0.131　mu　mol　center　dot　L-1.　Furthermore,　complex　1a　presented　the　semiquantitative　visual　detection　ability　for　HSO3-　in　the　test　trip　mode　via　fluorescence　changes.　CCDC:　2308664,　1a;　2308665,　2a.