To achieve the optimization of MCM search by UUV group,five main factors which influence the effects of MCM search by UUV group are briefly analyzed,including detection probability,search time,UUV quantity, grouping method and difficulty of implementation. Besides,the evaluation index system for the optimization of search method is established. Then,comprehensive analysis is conducted on multiple evaluation indexes using principal component analysis method. Finally,the four types of MCM search scheme are optimized and evaluated,providing decision-making basis for the research on how to choose effective search method in different conditions