The architectural components of the commonDCbus motor test system based on LabVIEW was introduced, the ASD servo driver with high precision and high dynamic response was adopted, and suitable current sensor and power analyzer were selected. The upper computer LabVIEW and MATLAB combined to drawn the motor MAP figure and external characteristic curve. The upper computer LabVIEW established relationship with the SQL database. The commonDCbus system optimized the energy circulation mode and realized internal circulation of energy on the bus side. According to the test results, the system had comprehensive functions, could achieved precise control and measurement, had high reliability, and could be used in the performance and durability tests of AC asynchronous motor or permanent magnet synchronous motor below 200 kW.