Minehunting is an important developing direction for all naval powers,and the detection and identification of sea mines are the most important components for minehunting operation. This paper analyzes influence of ocean environment on the detection and identification of minehunting sonar,including acoustic propagation loss,reverberation,TS,ocean current,tide and so on. The paper also proposes countermeasures and proposals about parameter setting,operation mode,data process and so on from the perspective of minehunting operation,which provide effective reference for target detection and identification such as mine and others.