[Objective] The aim was to study the function of Laminaria japonica fermentation broth on the growth of unicellular algae.[Method] L.japonica was washed,dried and grinded to prepare its fermentation broth.Adding the Saccharomyces cerevisiae and Acetobacter aceti for fermentation,the change of fermentation broth character was determined preand post fermentation.Dunaliella salina and Nitzsehia closteztuma was inoculated into F/2 medium(CK),and it with 2.5%(test group 1)and 5.0%(test group 2)fermentation broth...