In electrical fields of various high frequencies (from 0.079 MHz to 25.119 MHz), dielectric properties of cured adhesive films with 2 different moisture contents were studied. 2 different types of polymer adhesives meant for high frequency gluing were measured. Dielectric properties, dielectric value and loss angle tangens, were measured on Agilent 4285a Precision LCR Meter apparatus with special probes. Results indicate that dielectric value of cured adhesive films is significantly lower (from 57 to 45 times) than that of the liquid adhesives. It was also noted that dielectric values for cured films taken directly from adhesive layers decrease in relation to increasing frequency, while the values for completely dried samples are more or less constant. Similarly, a decrease of loss angle tangens was observed for both types of adhesive films for frequencies up to 5.012 MHz. After that a rapid growth was observed.