As the previous control system of the double-roll mechanism could not meet the requirement of wind tunnel testing, a new control system which consists of standalone motion control card, servo amplifier, epistatic computer and intelligent remote operating panel was developed. The overall hardware scheme and the software design are described respectively. The new system can be operated through PC in the control room and through the intelligent remote operating panel in the test section respectively and has been put into operation for about 2 years. Its application in the wind tunnel testing shows that the control precision can meet the system requirement. The operating convenience and system reliability has been evidently enhanced.