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The effect of pesticide application depends on the effective deposition of droplets on crop target and distribution in canopy.Research on the influence of crop canopy structure on droplets deposit distribution will provide technology basis for optimization of crop protection machine and choice of application and is good for reasonable pesticide application and improving pesticide efficacy.In this paper, the wheat is taken as target and the canopy structure is changed to carry out the spraying research.The result shows that: with the increasing of the planting density, the LAI is increased but reduced from top of canopy to bottom; the DIFN is reduced but increased from top of canopy to bottom; the droplets deposition is reduced and reduced from top of canopy to bottom.So the interception of canopy to droplets is obvious.