A use of antcin compound for improving algal bloom is disclosed, wherein the antcin compound is administered to a freshwater waterbody to inhibit over proliferation of algal cells in the freshwater waterbody. The antcin compound is selected from antcin A, antcin B, antcin C, antcin H or antcin K.一種樟菇酸類化合物用以改善藻華現象之用途,該樟菇酸類化合物係投於一淡水水體,以抑制該淡水水體中藻細胞之過度增殖;其中,該樟菇酸類化合物係選自樟菇酸A、樟菇酸B、樟菇酸C、樟菇酸H或樟菇酸K。