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The high-precision measurement of Higgs boson properties is one of theprimary goals of the Circular Electron Positron Collider (CEPC). Themeasurements of $H\to b\bar{b}/c\bar{c}/gg$ decay branching fraction in theCEPC experiment is presented, considering a scenario of analysing 5000$\mathrm{fb}^{-1}$ $e^{+}e^{-}$ collision data with the center-of-mass energyof 250 GeV. In this study the Higgs bosons are produced in association with apair of leptons, dominantly mediated by the $ZH$ production process. Thestatistical uncertainty of the signal cross section is estimated to be about 1% in the $H\to b\bar{b}$ final state, and approximately 5 % - 10 % in the $H\toc\bar{c}/gg$ final states. In addition, the main sources of the systematicuncertainties and their impacts to the measurements of branching fractions arediscussed. This study demonstrates the potential of precise measurement of thehadronic final states of the Higgs boson decay at the CEPC, and will providekey information to understand the Yukawa couplings between the Higgs boson andquarks, which are predicted to be the origin of quarks' masses in the StandardModel.

Measurements of decay branching fractions of $H\to b\bar{b}/c\bar{c}/gg$ in associated $(e^{+}e^{-}/\mu^{+}\mu^{-})H$ production at the CEPC