According to analyzing the function and characteristics of digital alarm system for nuclear power plants,the principle of indicator screening and some common Quantitative Meth-ods,this paper constructed a digital alarm system evaluation indicators system composed of 18 indicators through the index screening approaches of cluster and Grey relational analysis. The indicators system consideration of the relevance and importance will be more scientific. The ap-plication example proved that the method was a valid evaluative method for indicator screening of digital alarm system in nuclear power pla...