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Plasma synthetic jet actuators are widely used in active flow control of high-speed flow field due to their advantages such as no need for external gas source, wide operating frequency band and great intensity of jet. In this paper, the chemical composition, electron temperature and electron density of the plasma jet of a designed synthetic actuator were experimentally studied by using the diagnosis method of emission spectrum of plasma. It is obtained that there are N atoms, N+ ions, Ar atoms, Ar+ ions, C atoms, O atoms, H atoms in the jet. The maximum of the average electron temperature is 5248.8K. With the increase of capacitance of the capacitor, the electron temperature of plasma increases. With the increase of the distance between the anode and the cathode, the electron temperature of plasma decreases. The impact of the distance between the anode and the cathode of the actuator on the electron temperature is greater than that of the discharge power of the actuator. The maximum plasma density was 5.47e23m-3. The plasma density increases with the increasing capacitance, and the plasma density first increases and then decreases with the increase of the distance between the anode and the cathode. In this experiment, the optimal discharge condition is the spacing between anode and cathode being 1.9mm and the capacitance being 0.48uF.
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