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Complex physical and chemical reactions in combustion chamber while aero-engine’s working will generate a large number of charged particles, causing the aero-engine electrification. The formation and evolution of charged particles is investigated using a theoretical model. Particular emphasis is placed on the comparative analysis (contrast analysis) of electrostatic testing principle and sensor scheme. A special electrostatic sensor, an electrostatic monitoring system, and an automatic monitoring software platform are developed. The efficiency of the platform is shown by the field test on a certain type of aircraft, which provides a large amount of exhaust gas electrostatic signal. Study results indicate that the starting and stopping process of aero-engine will produce significant electrostatic signal, the polarity of aero-engine normal exhaust gas’s charged particles is positive, the average volume charge density is 0.077nC/m³, the equivalent charging current is 2.26nA, the corona discharge frequency caused by aero-engine exhaust electrification is 14kHz.