The influence of low temperature on the optical properties of polyimide films and its polymeric composition (PC) with powder filler of high-temperature superconductor (HTS) YBa2Cu3O6+x (where x=0,7) and concentration: 0,05%;0,01%; 0,5% were investigated. The optical characteristics were studied in spectral range 190-1100 nm on spectrophotometer SF-2000. It was established, that the cooling by liquid nitrogen causes the reduction of light-transmission coefficient on 3-6%, but there is no any

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... ging in optical dencities, and it may be because of the decreasing of free ions concentrations in the polyimide film structure. For PC with HTS filler 0,05%; 0,1% light-transmission coefficient after cooling remains unchangeable, but for concentration with 0,5% the increase light-transmission factor on 15% was found. These facts are evidence of processes with inverse re-structural changing's.