Annotation: The issues of experimental methods of studying biological water properties are considered. The existing problems of theoretical and experimental studies of water properties are described, the key value of features of the structure of water for normal functioning of living organisms is shown. Since the standard classical methods of physical and chemical analysis do not provide the possibility of implementing experimental evaluation of specific biological properties of water, as an alternative, there is proposed a method of recording gas discharge irradiance of liquidphase objects in an electromagnetic field followed by software image processing based on wavelet analysis. The efficiency of the proposed method was tested on real data samples for distilled water samples and natural water. The results obtained from the extraction of specific parameters of structural features of gas discharge radiance images demonstrate the effectiveness of wavelet analysis algorithms for images of radiation of water samples with different biological properties.