Abstract: The thiolterminated βcyclodextrin derivative(βCDd) was attached to the surface of ld electrode of quartz crystal resonator by selfassembly. The inclusion reactions of αnaphthalenesulfonate and βnaphthalenesulfonate with βCDd were monitored in situ by using quartz crystal microbalance (QCM). The influences of temperature, concentration, and the substituting position on naphthalene nucleus on the inclusion constant(Kin) and the rate constant(ka) were investigated. The relational expressions of Kin and ka were deduced theoretically and were testified by experimental results. The results obtained indicated that the stoichiometry of the inclusion complexes formed is 1:1 for the host βCDd with naphthalenesulfonate, that the inclusion reactions tallied the Langmuir adsorption model, that the substituting position on naphthalene nucleus has great effect on Kin and ka , and that the inclusion behaviors of the two derivatives with substituent at different positions with βCDd show obvious difference.