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To improve equipment utilization of medium-voltage distribution network, the influencing factors which could affect the best utilization load rate of equipment and the best utilization load rate of equipment are studied. Firstly, the factors that affect the medium voltage line and main transformer from the network structure and load development are studied. Then, according to connection mode of line, the best utilization of medium voltage line is studied. Finally, considered the influencing factors such as connection of main transformers in the same substation, connection of main transformers in different substations, overload factor of main transformer, the substation model is built to study the best utilization of main transformer.