Abstract: In order to learn boom movements under different excitation signals, the static suspension-boom models with spring-damper modular was set up in this paper based on the geometrics of a multifunctional wide sprayer worked on paddy field. The proper spring-damper parameters were obtained after the synthetical analysis of pulse response, step response and frequency response of the model in the frequency domain, dynamic simulation of the model was made under these parameters and the displacement of the tips of boom and boom suspension was observed under different excitation signals. The research showed that installation location of modular was not the prime parameter influences suspension performance, effect of rotation motion on the boom was greater than the translation motion. The model with spring-damper modular can meet the need of design requirements.