Abstract: Under the current equipment configuration condition of train control system for Chinese high-speed railways, there are problems such as high work intensity, difficulty in making control decisions, and low energy consumption due to drivers' insufficient train operation experience. Manual driving cannot meet the higher operational quality requirements of high-speed railways. Based on the technology platform of Train Control and Management System (TCMS), the driving assistent system for high-speed train is developed. This system can automatically collect information related to train operation control. With the goals of safety, punctuality, and energy conservation, a train operation control and energy consumption optimization model is established, which can dynamically generate the planned optimal target speed curve suitable for different train operation scenarios, provide optimal driving guidance for drivers, reduce the difficulty of driver's decision making on train operations, and improve driving safety and energy efficiency; Based on the TCMS's constant speed control function, section cruise control function has also been implemented, enriching the automation mode of high-speed train operation, greatly reducing the workload of drivers, and ensuring the accuracy of train start and stop. The system is managed and controlled by TCMS, which can enable it fail to safe, ensuring its safety and maintainability. Through real train test, the effectiveness and good energy-saving effects of the optimal driving guidance generated by the system have been preliminarily verified.