  Transverse momentum-dependent parton distribution functions (TMDs) provide
three-dimensional imaging of the nucleon in the momentum space. With its
fundamental importance in understanding the spin structure of the nucleon, the
precise measurement of TMDs is considered as one of the main physics topics of
the proposed Electron-Ion Collider in China (EicC). In this paper, we
investigate the impact of future semi-inclusive deep inelastic scattering
(SIDIS) data from EicC on the extraction of TMDs. Taking the Sivers function as
an example, we revisited the world SIDIS data, which serves as the input for
the simulated EicC data. By performing a combined analysis of the world data
and the EicC simulated data, we quantitatively demonstrate that the Sivers
functions can be precisely determined for various quark flavors, especially for
sea quarks, in the region, $x>0.005$, directly covered by the EicC.
