Abstract: How to economize energy and reduce the cost of oil transportation is the key link for an oil transportation unit to bring up its economic efficiency, Protracted experiences in production have made it possible for us to realize quite well the automatic governing of the loop oil transportation with pumps in series by manipulating one executive mechanism—a hydraulic output adjusting valve with a control contact for combined multiple instruments.This automatic governing system is steady and reliable after putting into commission, showing considerable advantages in saving energy and reducing oil transportation cost. This presentation will surely be of significance to oil pipelining departments.