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Recently, in the field of supramolecular chemistry much attention is paid to obtain a rotaxanes, which are inclusion complexes consisting of cyclic molecules being strung on a linear molecule. According to a specialists opinion involved in the supramolecular area, one of the most difficult task is to define a composition of rotaxane's inclusion complex. The method of pyrolysis mass spectrometry allows the structure of “host-guest” complex to be investigated. In this work the structure of pseudorotaxane based on β -cyclodextrin and polyoxypropylenedimethacrylate was studied by the pyrolysis mass spectrometry method. A probable composition of ion fragments and intensity of their emissions in the mass spectra was established during pyrolysis of pure both β-cyclodextrin and polyoxypropylenedimethacrylate, their physical mixture and pseudorotaxane. Thus, the results obtained confirm the formation of pseudorotaxane's structure. [ABSTRACT FROM AUTHOR]