Cars will be driven by electric motor from the viewpoints of environmental conservation and lower-fuel consumption in the near future. In electric drive systems, decentralized arrangement of the drive unit is possible. Herewith, a driving force distribution system, which needs a complex mechanism, now, will be realized with comparative ease so far. In addition, a direct yaw moment control (DYC) with a fast response and accurate driving torque by the motor will be possible and expected to enlarge vehicle dynamics performance. The research that uses the tire force to its maximum has been done by the combination of the driving/braking torque and the independent steer, and the improvement of the limit performance is suggested. Moreover, the research to which the dynamics performance is improved by the thing combined with DYC and other systems, for instance, active front steer (AFS) and active rear steer (ARS) is done. In this paper, a study of the improvement of driving operation and the dynamics performance by a simple rear right-left independent driving vehicle is conducted. The precondition is to think about more realizable system by avoiding the complication of a mechanism. On rear drive system, there is a possibility that the vehicle characteristic becomes unstable due to the slip angle - lateral force gradient decrease when the vehicle has accelerated. The gradient is named 'local Cp' in this paper. And, it is not evaluated enough how the DYC effects on driver's maneuver. Furthermore, It is proposed to keep the stability of the DYC vehicle by limiting yaw rate from acceleration/deceleration and friction between tire and road. But, the local Cp reduction is not minded in the paper. For conventional vehicle, research that a driver operation and vehicle motion on cornering with acceleration was conducted and it was proposed that the combination of driving/braking and steering was important to effectively uses tire force. First of all, stabilization logic on acceleration in turn situations is designed and the improvement of the vehicle dynamics by DYC is validated by the simulation for a certain vehicle. Next, the influence on the driver is evaluated with a driving simulator. As a result, it is confirmed that driver's unnecessary steering decreased since the stability of the vehicle is increased.