At 9:17 am on July 1, 2022, accompanied by the thundering sound of firecrackers and burning torches, the commissioning test of No. 3 desulfurization station in Daniudi Gas Field was successful and smoothly put into operation. The process control system of No. 3 desulfurization station adopts Hollysys large LK PLC control system *********, SIS system adopts Hollysys large safety PLC LKS series, and host computer adopts HollyControl software. The system runs statically and has strong capacity expansion. Fully meet the oil and gas industry control system gradually to the demand for localization, Jinan and Lisi seize the opportunity, keep up with the situation, towards the goal of industrial process PLC control system hardware and software complete localization.