In order to improve the speed and accuracy of on-line checking of relay protection

this paper proposed to recover the tuning and verification data of the EMS system to the acknowledge base each time

so as to provide real and reliable data for the next verification.Thus

the uniform data cycle system between the protection system and the verification system can be formed.With an increase in the verification time

data in the acknowledge base are constantly improved

we can just search the match data during each verification.Moreover

important degree of the branch structure and branch probability are defined.It suggests the corresponding protection devices can be ranked according to the branch importance

on this basis

each protection device can be verified.This method can avoid the blindness during random checking of the power system relay protection

and improve the settings verification speed.