Abstract: The attention has focused on quantifying the capability of nondestructive testing (NDT) system for guaranteeing structural safety through damage tolerance analysis.A method of reliability assessment for engine blades NDT is presented,which can determine exactly the probability of flaw detection(POD)and assess the probability of flaws missed(POM)in the engine blades,as well as control the largest size of the flaws missed at inspections with high probability of flaw detection and confidence level.This method also raises the flaw detection probability and prevents the flight accidents caused by the missed flaws in engine blades.