The method of civil aircraft engine condition monitoring and fault diagnosis is studied. Come up with a new monitoring techniques, which can reflect real parts fault information, early warning failure. In this paper, electrostatic monitoring principle is analyzed, and electrostatic monitoring system and experimental platform had been designed and developed. The circulation lubrication conditions pin plate sliding friction and wear experiment is carried out, using a homemade electrostatic sensor circuit in fluid abrasive grains to montor. The results show that the oil-line electrostatic sensor can monitor the charged particles of various metallic materials, inductive voltage is relevant to the debris size, shape of the inductive voltage is relevant to the debris charging characteristics, indicating availability of on-line monitoring in the model of electrostatic sensor and providing a further evidence for the fault.