When diamond is produced by traditional sixsided and twoside pressure machine, vice pump is often used to maintain constant pressure during the pressureholding stage. It is inevitable to produce pressure pulsation. The energy supply mode of distributed electric direct drive was used to research the threechannel pressure compensation strategy for the pressureholding stage, which achieved the accurate control of pressure. This system avoids the energy waste of the traditional valve control system and the slow response in the pump control system. In addition, it explores a new way to control the pressure of artificial diamond press.