Research purposes:Currently，railway passenger dedicated line adopts up and down AT all-paralleling feeding system，which uses short-circuit test(man-made short-circuit point ) to check its protection reliability and distance measurement accuracy. As the destructiveness and fatalness of the short-circuit test，it is very difficult to operate，the cost is very high，there are also limit for test times and flexibility. This paper analyzes the feasibility to adopt locomotive load monitoring and imitating short-circuit test to measure distance，to explore a safe and reliable test scheme.
Research conclusions ; The research proves that the locomotive load current distribution ratio is the same to the current distribution ration under short-circuit condition. So it is workable to make research with locomotive load current value instead of short-circuit parameters. The verified parameters calculated with locomotive load apply to the protective value of the failure distance and locate the actual failure point. Establish the T-R short-circuit ratio curve graph of each section of the whole line by using a large amount of data，and then confirm the failure point location by seeking table method. This technology could be applied to up and down all-paralleling AT feeding systems distance measurement accuracy verification and formulas of newly built and operational railway passenger dedicated line to verify parameters.
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