Abstract: Based on the field test and data analysis of the stray current along existing urban rail transit lines, it is proposed that the use of special rail return current power supply system is the fundamental solution to stray current leakage and pipeline corrosion along the line. The difference between running rail return current and special rail return current is analyzed, and the system design scheme of ‘overhead contact system combined with special rail return current’ according to the practical application scope of the project is put forward. The performance of adopting special rail return current power supply system is analyzed, and the design requirements of special return current rail is expounded.