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To solve the problem that the detection sensitivity of the sky screen is reduced by the external environment, the sensitivity of the sky screen target is proposed based on the automatic control principle. The method uses the background brightness of the sky, the noise level and the projectile speed as the adjustment factors. The liquid crystal dimming film controls the luminous flux, changes the resistance of the bias resistor, and changes the circuit amplification factor through the process control amplifier to achieve the sensitivity stability requirement. Experiments show that the amplitude fluctuation range of the sky screen target signal is reduced to 35%, which improves the sensitivity of the sky screen target, and achieves the requirements of strong adaptability and sensitivity of the sky screen target.