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The drive and control system of a traction machine is a critical part for a vertical elevator, which has great effects for elevator performance and thus is well worthy to be studied. A multi-mode PID method is introduced for permanent magnet synchronous traction machine control as well as the overall design scheme of the drive and control system. The system is divided into three parts, including main control module, drive module and signal acquisition module, all introduced in details of hardware circuit. Dual-loop control algorithm, speed loop and current loop, is employed for traction control and the corresponding flow diagram of DSP software is presented. Studies for multi-mode PID control algorithm in the speed loop is introduced. According to in-field debugging, the elevtor can precisely follow all given speed curves with small overshoot and steady-state error, and can well meet the requirements of elevator control.