Traditional verification method is not suitable for complex equipment MTTR verify directly for they are more integrative and modularized. A method for group-verification is brought up which comprises sub-system of the complex equipment based on degree of similarity of MTTR curve. Determine similarity degrees of curves. Group by layers and priorities based on similarity, and then verify groups by traditional verification method. The method has been proven efficient in avoiding complex equipment MTTR verification problems and will give guidance in this area.