Anisotropic superconductivity in the topological crystalline metal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Pb</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">TaS</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> with multiple Dirac fermions

Topological crystalline metals/semimetals (TCMs) have stimulated a great research interest, which broaden the classification of topological phases and provide valuable platform to explore superconductivity. Here, we report discovery superconductivity features in Pb-intercalated transition-metal dichalcogenide Pb$_{1/3}$TaS$_2$. Systematic measurements indicate that Pb$_{1/3}$TaS$_2$ is quasi-two-dimensional (q-2D) type-II superconductor ({\em T}$_c \approx$ 2.8 K) with significantly enhanced anisotropy upper critical field ($\gamma_{H_{c2}}$ = $H_{c2}^{ab}/H_{c2}^{c}$ $\approx$ 17). In addition, first-principles calculations reveal hosts multiple Dirac fermions electronic band structure. We discover four groups nodal lines on $k_z \pi$ plane two sets points rotation/screw axes, are protected by symmetries robust against spin-orbit coupling (SOC). Dirac-cone-like surface states emerge (001) because inversion. Our work shows TCM candidate promising arena study interplay between fermions.