Abstract: The precision control system is of great importance to the safe operation of the electric generator. Introduces the status quo of condensate refining control system of unit #1 and #2 of a company, analyzes the faults of the refining control system, summarizes the existing risks and hidden dangers of the refining control system, and puts forward the reliability improvement scheme of the condensate refining control system of unit #1 and #2, and the direction and target of subsequent upgrading. The renovation scheme improves the overall safety of the condensate refining control system of unit #1 and #2, and provides a useful reference for the upgrading of the same type of condensate refining control system.