In recent years，phycotoxins have become a worldwide problem，and caused numerous ecological perturba­tions and greater economic losses，as well as the damage to the public healthi and quality assurance of sheifishi prod­ucts. In order to monitor the phycotoxins effectively，many countries emphasize    developing  detection methods，espe-cially that could be used to monitor t!ie phycotoxin on spot. Of these  methods,which are based on the immunology  or enzyme reaction，the electrochemical   biosensor has became one  of t!ie leading technologies. Therefore，we  highlighted the composition and basic  principle of the electrochemical biosensor，as well as the application of biosensor in the field of phycotoxins，wit!i   a view to providing some background    for the future research and application of phycotoxins  in China. [Chinese Fishery Quality and Standards，2015，5(3):47 -53]