The droplet spectrum is one of the most important factors to the aerial spray drift of the fixed-wing applications in crop protection. Based on the IEA-I high speed wind tunnel, we tested two kind of pressure nozzles of Lechler Co.Ltd. with Marvern Spraytec system. The experimental results showed that when the wind speed increased, the VMD of the droplets generated by the LU-120-02 fan nozzle increased at the low wind speed zone and decreased at the high wind speed zone. However, the VMD of the droplets generated by the IDK-03 anti-drift nozzle stay constant at low wind speed zone and decreased at the high wind speed zone.  The pressure in the tube could also influence the VMD of the droplets. Generally, higher tube pressure could decrease the VMD of the droplets. However, when the wind speed increased, its effect to the VMD of the droplets become much weaker. Additionally, the test distance from the nozzle exit to the laser was also found effective to the droplet spectrum.

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