Abstract: This is mainly about the research on dermal exposures and primary spraying conditions influencing dermal exposures during spraying applications with the knapsack sprayer (3WS-16) and the motorized knapsack sprayer (WFB-18AC) in summer when the temperature was high. The results indicated that right hand, left hand, right upper arm and right forearm were more polluted with knapsack sprayers, while the correspondence parts were left upper arm and left forearm with power sprayers; There were highly linear correlation between the major pollutions and the secondary pollutions; Dermal exposures were affected by sprayer, nozzle flow, operating environments, crop conditions and spraying mode; And the wind and crop height were primary influence factors after the single factor interactions. The results were availability in practice application of improving the spraying technology and reducing dermal exposures.