Abstract: The mutual induction coefficient between power supply line and signal cable when high-speed railway and low-medium speed maglev line intercross is calculated by continuous integral method instead of segmentation method. By reverse derivation of obtaining equivalent disturbing current from site-measured space magnetic field value, the equivalent disturbing current of complex power supply network is determined. The longitudinal induced electromotive force from high-speed railway traction power supply system to low-medium speed maglev signal cables, and that from low-medium speed maglev traction power supply system to railway signal cables under various intercrossing conditions are calculated. Taking the practical case of Changsha low-medium speed maglev line and Shanghai-Kunming High-speed Railway intercrossing for calculation, the comparative analysis of calculation and site-measured results demonstrate good agreement. The result verifies the accuracy of the influence analysis calculation method.