Abstract: Based on Daqin Railway, this paper studied the framework of moving block system for heavy haul railway. According to the principle of moving block, the paper designed the framework of moving block system for heavy haul railway, introduced the key points of system framework design, the new key technologies for the existing signal system of heavy haul railway to implement the moving block function, the key technologies and equipments that need to be added for the existing signal system of heavy haul railway to implement the moving block function, and the safety function of moving block based on train position tracking. The introduction of moving block system into existing heavy haul lines can improve the freight transport capacity of Daqin Railway and even heavy haul railway in China.