Abstract: The paper introduces an automatic supervisory control system which is made up of AST386 computer and STD bus industrial control equipment, and which monitors and controls in two levels the operation status of the pump units in oil pump stations.Analysis is made in light of practical cases on a series of parameters such as configuration, selection of the monitored point, calculation parameters, control alarm, power failure protection, etc.The designing of application softwares both for upper level and lower level machines are described in detail.Upper level application softwares consist of three parts: softwares for graphic display.statistics softwares and softwares for vibrication analysis, with each part achieving its tasks concerned in the upper level.The key to system design is the application softwares for lower level machines, which have an immediate effect on the realization of some critical objectives for system supervisory control, such as precision, stability and universality, and in which lies the essential difference between computer control and conventional instrumentation.With the concept of systematic engineering and the principle of software design.system hardwares are designed from top to bottom, with software objectives determined.Then all of the separate modules are set up by bottom to top programming.It is pointed out that the system in question is of great significance for ensuring safe and reliable station operation and for enhancing scientific management.