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With the rapid development of electric railway in China, AC-DC-AC electric locomotives are widely used at the same time, the resulting harmonic problems on the power grid has become increasingly prominent. In order to study the harmonic characteristics of the traction power supply system better, the main electrical quantity parameters of the traction substation and the partition in a power supply section of the Xi"an North Loop Line traction power supply system are measured synchronously, and a number of typical moments are selected in the test data for a period of time. Through the data analysis of the typical moment, the results demonstrate that the harmonic characteristics of the power supply section show a certain law, and some reasonable suggestions are provided for its suppression.