  HoTe$_{3}$, a member of the rare-earth tritelluride ($R$Te$_{3}$) family, and
its Pd-intercalated compounds, Pd$_x$HoTe$_{3}$, where superconductivity (SC)
sets in as the charge-density wave (CDW) transition is suppressed by the
intercalation of a small amount of Pd, are investigated using angle-resolved
photoemission spectroscopy (ARPES) and electrical resistivity. Two
incommensurate CDWs with perpendicular nesting vectors are observed in
HoTe$_{3}$ at low temperatures. With a slight Pd intercalation ($x$ = 0.01),
the large CDW gap decreases and the small one increases. The momentum
dependence of the gaps along the inner Fermi surface (FS) evolves from
orthorhombicity to near tetragonality, manifesting the competition between two
CDW orders. At $x$ = 0.02, both CDW gaps decreases with the emergence of SC.
Further increasing the content of Pd for $x$ = 0.04 will completely suppress
the CDW instabilities and give rise to the maximal SC order. The evolution of
the electronic structures and electron-phonon couplings (EPCs) of the multiple
CDWs upon Pd intercalation are carefully scrutinized. We discuss the interplay
between multiple CDW orders, and the competition between CDW and SC in detail.
