Abstract: The structure and characteristics of world′s mainstream signaling systems, such as European ETCS, American PTC system and urban rail transit CBTC system are analyzed. Based on the basic requirements of future train control system, a train\|centric CBTC system based on train\|train communication is proposed, and key application scenarios such as train operating the approach autonomously, turn\|back and virtual coupling are specifically studied. Developing direction of key technologies that can realize train\|centric CBTC system is given.