Vehicular powertrain testbench was designed by utilizing two load motors installed at both ends of the differential which simulated the driving resistance, and one drive motor which drove the powertrain system instead of I.C. engine. A LabVIEW based measurement and control system for the testbench were developed. CAN signals of powertrain’s master controllers, serial signals of electric driven system based on USS and MODBUS protocol were sampled and monitored at real-time and synchronously. The system integrated various communication protocols in one platform and had a good portability and scalability. This testbench was used in applications of reliability test for hybrid powertrain system with ISG (integrated starter/generator). The basic performances of key components of electromagnetic coupling power synthesis box, and the dynamic performance on simulated working condition were also tested so as to provide a valuable reference for control strategy formulation and parameter optimization. 