Abstract: Technologically, a pump station is often equiped with a single pump, double pumps or three pumps in operation. Considering that two power transformers installed at each pump station were prevailed in 1970s and to make power transformers be at the optimum state, the article, based on the operating data in production, makes a study of the different way to supply power on the part of transformers with double and three pumps in operation respectively, calculates power consumption, and eventually works out the optimum operating mode, making some contribution to energy economization in pipeline industry.