The theory and general method of construction of the phase dynamic studies of rapid periodical processes with high temporal resolution is described briefly. Moreover, problems are discussed that are associated with the introduction of external pulses into dynamic studies in LIST-mode, the spatial and temporal reconstruction from LIST-mode, the computer's construction of phase dynamic studies, the selection of correct cycles, the creation of phase histograms and processing of the phase studies. The method is illustrated by a general program LIST leads to PHASE DYNAM. STUDY created for Clincom apparatus. In addition to the general method, there is mentioned here the modification of the simplified procedure--a well-known EKG-gated method. Some aspects of the method are documented by the results of phantom measurement and clinical examinations.