Complex formation of water-soluble polyparacyclophanes bearing two diphenylmethane or two diphenyl ether skeletons with l-anilinonaphthalene-8-sulfonate (ANS) and 2-p-toluidinylnaphthalene-6-sulfonate (TNS) was investigated quantitatively to develop useful host compounds comparing with ${alpha};-;and;{eta}-cyc1odextrins$$({alpha}-;and;{eta}-CyDs$) in aqueous solution. Benesi-Hildebrand type analysis of the fluorescent intensity showed that the dissociation constants (Kd) of paracyclophane-ANS complexes were $1.55;{ imes};10^{-4}M$ for 1,6,20,25-tetraaza[6.1.6.1]paracyclophane(CPM 44) and $1.23;{ imes};10^{-4}M$ for 1,7,21,27-tetraaza[7.1.7.1]paracyclophane (CPM 55), and those of paracyclophane-TNS complexes were $6.99;{ imes};10^{-6}M$ for CPM 44 and $6.23;{ imes};10^{-5}M$ for CPM 55, in 1:1 molar ratio. On the other hand, the Kd values of 1,7,21,27-tetraaza-14,34-dioxa[7.1.7.1]paracyclophane (CPE 55)-ANS, 1,8,22,29-tetraaza-15,36-dioxa[8.1.8.1]paracyclophane (CPE 66)-ANS, CPE 55-TNS, CPE 66-TNS complexes were $1.75;{ imes};10^{-3}M$, $3.07;{ imes};10^{-3}M$, $3.75;{ imes};10^{-3}M$ and $2.15;{ imes};10^{-3}M$, respectively. On the contrary, the Kd values of ${alpha}-CyD-ANS$, ${eta}-CyD-ANS$, ${alpha}-CyD-TNS$ and ${eta}-CyD-TNS$ complexes were found to be $3.98;{ imes};10^{-2}M$, $1.05;{ imes};10^{-2}M$, $1.38;{ imes};10^{-2}M$ and $3.52;{ imes};10^{-4}M$, respectively. These results mean that the complexation of CPMs with ANS or TNS is by 5.6-1,975 fold stronger than that for ${alpha}-or;{eta}-CyDs$, and the complex formation of CPEs with ANS or TNS is nearly same as or somewhat stronger than that for ${alpha}-or;{eta}-CyDs$. From the Kd values determined at different temperatures, thermodynamic parameters were calculated and the complexation was found to be a spontaneous exothermic reaction. The effects of pH on Kd values of CPM 44-ANS, and CPM 55-ANS complexes were negligible in the range of pH 1.2-1.8. However, the Kd values of these complexes increased significantly with increasing ionic strength.