Аннотация:The algorithms used for reduction of data obtained in a Fabry-Perot interferometer mode of the new focal reducer of the 6 m telescope SCORPIO are described. The main attention is focused on the procedures of photometry correction of channels and night sky emission subtraction, which is especially important for observations with a CCD in comparison with a photon counter. The influence of various sources of errors on measurements of radial velocities in a data cube is investigated. Examples of velocity field construction by using emission lines in the galaxy NGC 6951 and absorption lines in the globular cluster M71 are presented.