This paper carries out the work of modal analysis for the vibration environment control requirements of a certain type of double-orbit rocket skid test. Through The finite element model was established for simulation analysis, compared with the modal test data, and the sensitivity analysis method was used to analyze the simulation model type was corrected and better low-order modal parameters were obtained. The method is useful for the fire of large full-size test pieces carrying The modal analysis of the rocket sled has a guiding role, and it is practical for the analysis of the vibration environment of the rocket sled when it is running at high speed Value.