Abstract: Microzooplankton has received increasing attentions as an important trophic link between the microbial loop and mesozooplankton. Therefore, this paper reviews the advances in the feeding ecology and the abundance and biomass of microzooplankton. It focuses on the methods with which the grazing pressure of microzooplankton on phytoplankton and primary production, the top-down and down-top effect caused by the herbivory of microzooplankton, and the main factors that influenced its herbivory. The study of feeding ecology of microzooplankton should go further.