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As the power system, oil source system plays a significant role in wind tunnel tests. Due to the long-term high pressure and corrosive operating environment, its components and structures could be facing aging problems. The typical wind tunnel is the main productive wind tunnel domestically which undertakes high frequent tasks in this paper. Consequently, the oil control system was reaching the design lifetime along with a series of failures. With the increasing time-consuming and sophisticated maintains work, wind tunnel will no longer fulfill the testing tasks. In such circumstances, a re-design of the oil control system becomes more urgent and crucial. This paper introduced the re-design of the certain wind tunnel oil source control system based on PLC in terms of hardware design, PLC software design and UI design. More specifically, it achieved multiple run-time functions such as start-stop control of machine pumps, stepless adjustment of oil pressure, oil cooling control, run-time condition monitoring, local and remote control for wind tunnel oil source system. This design provide a high degree of automation and expansion capability for the system.