In order to standardize the emergency preparedness for terrorist attacks and improve the ability of key places to deal with terrorist attacks, an evaluation method of emergency preparedness for terrorist attacks is carried out. Firstly, based on the "scenario task capability" planning analysis theory and Delphi expert consultation method, an emergency preparedness capability evaluation index system with 4 primary indicators, 10 secondary indicators and 49 tertiary indicators is constructed; Then,the index is given weight with the help of analytic hierarc hy process; Finally, taking the high voltage substation in A city as an assessment object, the application of emergency preparedness capability evaluation is carried out. The results show that the overall terrorist attack emergency preparedness capacity of the power station is in a good state, in which the indicators such as site prevention, monitoring and early warning, alarm arrival and early attack are in a qualified state, there are great hidden dangers, which need to be paid more attention.