Measurements and Searches of Higgs boson decays to two fermions

The interaction of the Higgs boson to fermion is most fragile part in the Standard model. The Higgs decay to ditau ($H\rightarrow \tau\tau$) was observed and established in the LHC Run 1 data. This report presents recent measurements and searches of Higgs boson decay to two fermions. In particular this report focuses on results of the Higgs b oson decays to third-generation ($H\rightarrow b\bar{b}$) and second-generation ($H\rightarrow c\bar{c}$, $H\rightarrow \mu\mu$) fermions using the LHC Run 2 data collected by the ATLAS experiment at the LHC.