Abstract: Aiming at the large-scale high ground clearance boom sprayer currently operating in the field, it is affected by the swing of the sprayer’s body and causing harmful motions such as oscillation, swaying and rolling.Combining the existing boom suspension system and functions, this article designs a ground-based.The double-link trapezoidal spray boom suspension with profiling function has carried out theoretical analysis and structural design on the lifting mechanism of the boom suspension, the folding mechanism of the boom, the height adjustment mechanism and the anti-collision rebound mechanism, and a three-dimensional model has been established.Through a four-factor and three-level orthogonal experimental design, the interactive effects of each factor on the quality of the spray bar and the first-order natural frequency are studied, and the design-expert software is used to analyze and optimize the experimental results.The optimization results show that when the wall thickness of No.1 square steel pipe, the wall thickness of No.2 square steel pipe, the wall thickness of rectangular steel pipe and the wall thickness of quadrilateral steel pipe are 5, 3, 4.5, 3.5mm, respectively, the mass is the smallest, which is 1146.8kg.The first-order natural frequency is 5.17 Hz, which effectively avoids the road excitation frequency.Using ANSYS Workbench software, with displacement power spectral density（PSD） function as excitation, random vibration simulations were performed on the sprayer boom models before and after optimization. The results showed that the vertical vibration displacement response amount after the optimization of the boom size was not significant changes.The research results provide a theoretical basis for the analysis of the vibration characteristics and fatigue characteristics of the sprayer boom.