In order to improve the fatigue life and transportation efficiency of mountainous orchard wheeled transporter,the excitation signal of the unevenness of typical road surface in hilly areas was used as vibration excitation to study the vibration characteristics of the leaf spring suspension and optimize the structure.Using LabVIEW as the host computer platform,the data acquisition card NI 9234 and acceleration sensor PCB352C33 was used to design the acceleration signal acquisition platform.After filtering the original acceleration signal,integral and FFT transform was performed to obtain the displacement frequency domain map．The road roughness signal collected was imported into ADAMS/View to get the roughness of the road surface when the transporter runs on the grass,mountainous and cement road.The frequency of the excitation signal acting on the leaf spring suspension mainly concentrates in 3-10 Hz，4-9 Hz and 2-7 Hz.There is an overlap with the first-order leaf spring suspension at the first-order frequency of 5.95 Hz,and resonance is easily generated.The fatigue life T is 9.4×104.By increasing the number of reeds to increase the stiffness of the suspension,the first-order frequency of the leaf spring suspension is optimized to be 18.59 Hz,and the fatigue life T is 3.5×105,which not only avoids resonance with the road surface input excitation but also increases life expectancy by 3.7 times.