Abstract Three-phase motor damage, burned for many reasons, such as: motor phase lack, motor stall, motor over-voltage flow, electric motor to blast owe pressure, temperature, the influence of motor running efficiency to improve efficiency and accuracy of the motor by computer, the subject of 3-phase ac induction motor temperature, voltage, current, power, and speed parameters, such as real-time control, once discover fault, the protection of the motor immediately, and the fault time, fault reason computer shown, in order to upload the line fault maintenance. This topic PC monitoring software development language visua1Basic6. 0, and choose the Tvisua1Basic6. 0 provide by MScomm controls to implement and lower place machine of serial communication. System design of the upper machine, including data display, analysis and backup, alarm system and failure analysis