This research is to design and build a mechanical Robot arm system for rehabilitation in hemiplegia patient. Have control over an application on mobile phones and computers. By value, the angle of the system resulting from mechanical arm mechanism is set to change the resistance of the potentiometers. For controlling the speed of batch mechanism system mechanical arms to control the width of the pulse signal (PWM) sent to the motor, the width of the pulse signal (PWM) this will be modified according to the desired speed. Through a wireless control system (Wi-Fi), which is based on experimental measurements and control without the patient bending. The results have shown that the system can control the speed, angle, starting the last corner and the number of cycles by the speed of batch mechanism system mechanical arm is in the range of 0.1 to 0.5 Rev/min, and the angle between 0 degrees to 90 degrees, with 0 and-90 degrees from horizontal level. In addition, the system also includes the installation of a battery to a power source. Make it easy to use even more jobs.