Abstract: This paper introduces the design flow and method of diverse actuation system（DAS） signals, and discusses the process of analyzing and confirming the acceptance criteria for fixing diverse actuation system protecting signal set. The method is clarified, and the acceptance criteria is confirmed for different operation conditions. Besides, the paper illustrates a preconceived accident in Fujian Fuqing Nuclear Power Plant to verify the acceptance criteria suggested, ensuring its validation and applicability, and establishing foundations for the subsequent work.