Abstract: Different characteristics of the polyaniline as conducting polymers and the progress in synthesis of polyaniline in recent years are summarized.Compared with other conducting polymers,the polyaniline has many prominent advantages and the preparation methods are various.The methods for preparing polyaniline,including chemical oxidation,electrochemical polyaniline,templare polyaniline,enzymatic polymerization,plasma polymerization,photopolymerization and so on are summarized and presented,and the structural performance of polyaniline prepared by different methods is introduced.Finally,the preparation methods of polyaniline in different forms are summarized,and the present application of polyaniline in different fields is introduced.