Based on the analysis of requirements and deficiencies of current online test equipment for gearbox and the principle of gear select and shift, an automatically gear select and shift testing mechanism powered by electricity, air and the electrical control system were designed. Through experiment, the properties such as stability, distance of run, second concussion, inhalation sensation could be researched. Through analyzing and calculating the experimental data, select and shift properties of gear shift are testified to excel the requirement. It provides experimental method and data to assess the select and shift properties.