Abstract: In CPR1000 NPP project, there are some none-safety classified actuators which perform safety function are controlled by both 1E and NC commands from DCS. It is mandatory to make a priority choice between 1E and NC commands if both commands arrive simultaneously. One kind of none-safety classified priority control technique adopts the design concept of priority logic comparison and 1E signal periodic test was proposed. The results show that this technique provides a favorable solution for the priority control and 1E command periodic test dedicated to the special kind of none safety classified equipment.