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Abstract. The manually high-volume spray techniques are widely used in China to apply plant-protection products in glasshouses, having poor efficiency due to heavy losses to the soil and high risks of worker exposure. Accordingly, a fixed-pipes twin fluid cold fogging system realized the ultra-low volume spray was designed based on the self-developed venturi nozzles. The system performance were investigated in comparison with a trolley cold fogger. Meanwhile peppers in fruiting period were chosen to explore the influence of canopy on droplet distribution of the fogging system. In the test, the air and water pressure of the fogging system were 0.3 MPa and 0.05 MPa with application rate of 2 L/min. The trolley cold fogger was placed at a distance of 2 m from the front collection area in the middle of the greenhouse, the angle between air cylinder and horizontal ground was 15°. The application rate of the trolley fogger was 1.5 L/min. The total application time was 5 min. Results show that compared with the trolley cold fogger, the droplet deposition coefficient of variation of the fogging system among different collection areas was only 13%, the fogging system can achieve unmanned pesticide application throughout the greenhouse with desired uniformity of droplet distribution; the presence of peppers was conducive to droplets gather on surrounding leaves, droplet deposition in vertical height in different regions had no significant difference. Consequently, the fogging system had better working performance and uniform droplet distribution can realize the separation work between human and the fogging system.