Abstract: Field experimental study on sprayer boom tension measurement was carried out due to the boom connector fracture problem of the amphibious boom sprayer. The sprayer boom tension measurement system was developped according to the boom assembly structure and force characteristics, and the static calibration of tension sensors was carried out. The sprayer runway was set in the field, then boom tension data acquisitions were obtained with three sprayer speed 1.93, 1.42,0.90 m/s. The acquisition results showed that, the maximum tension increased as the sprayer speed increased. The maximum static tensions of the boom with three different machine speeds were reasoned according to the Gumbel extreme value theory, and the maximum tensions were 1 000, 700, 500 N, respectively for the three sprayer speeds. The data spectrum analysis was conducted based on the acquisited data and it was found the boom tension signal was mainly low frequency signal within 0~13 Hz.