Abstract: Method of dynamic balancing of rotating machines in assembled condition, the machines being symmetrical to their center of weight. The effective value of the speed of radial vibrations arising from unbalance when the machine is running at no-load speed and is vibro-isolated from the surrounding media are measured by measuring the relative acceleration phases of the vibrations. Correction masses are estimated for each balancing plane by dividing the measured effective speed values by a constant characterizing the machines of a given type, which is determined beforehand. When the machine is dismantled, correction masses are placed in the balancing planes at angles obtained from the determined relative acceleration phases plus 270.degree. they added along the directional rotation of the rotor of the machine. These angles are measured according to a mark on the shaft of the machine.