For the liquid lubrication system operating at microgravity conditions in space，a new mode of oil supply was proposed based on the harmonic principle.The oil was supplied to the friction surface by means of the elastomer deformation and particle vibration from storage chamber.The purpose of oil supplying with no need for pump was achieved.The theoretical modes were founded on the radial bending deformation and a particle vibration of the elastomer; The deformation and particle vibration were calculated and analyzed utilizing finite element software; The affection on lubrication performance was studied which was caused by the structure parameters of elastomer，such as the wall thickness，the diameter of connecting oil-hole.The calculation results show that:the performance of oil supplying varies with the elastomer thickness，diameter and inclination angle of connecting oil-hole.Under the working load，the radial bending deformation of the elastomer and the vibration of the particle along the radial direction are occurred to supply the oil to friction surface from storage chamber.The calculation results verify the feasibility of oil supply principle for the designed lubrication system.