Research purposes: The section post is installed on the ends of feeding section for parallel feeding to up and down tracks on the double—track electrified railway，which can improve the voltage level and reduce energy loss of the traction electric network equivalently．In this paper，the researches are done on how to choose and determine the load capacity of section post rationally and the methods for calculating the maximum load current and the maximum equivalent current in the section post are presented se as to provide the basis for selection of electric equipments for section post．
Research conclusions: The maximum traction 10ad of section post arises under the conditions that the fleet trains run in the heavy—duty direction and no train runs in the light—duty direction．Both the maximum 10ad current and the maximum equivalent current in the section post increase linearly with the increase of train quantity．The max．Equivalent current of the section post can be taken approximately by 30％of the total current separately feeding to the up and down tracks at the first end in the heavy—duty direction when there is less fleet train and call be taken by quarter when there is much fleet train．
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