The invention relates to a method for securing the operation of a synthetic viewing system of an aircraft. This method comprises the steps of determining at least one control object in the field of view of the synthetic vision system and determining at least one control point belonging to each control object and verifying the consistency of the display of the synthetic vision system. The verification step comprises the sub-steps of recovering a first position corresponding to the displayed position of each control point on the corresponding outline on the display of the synthetic vision system, determining a second position of each control point on the display of the synthetic vision system and comparing the first and second positions.