Quasi-two-dimensional Fermi surface of superconducting line-nodal metal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>CaSb</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>

We report on the Fermi surfaces and superconducting parameters of CaSb$_2$ single crystals (superconducting below $T_{\text{c}}\sim 1.8~\text{K}$) grown by self-flux method. The frequency de-Haas-van-Alphen Shubnikov-de-Haas oscillations evidences a quasi-two-dimensional (quasi-2D) surface, consistent with one forming Dirac lines predicted first-principles calculations. Measurements in state reveal that is close to type-I superconductor Ginzburg-Landau (GL) parameter around unity. temperature dependence upper critical field $H_{\text{c2}}$ well described model considering two bands, enhancement effective mass estimated from $H_{\text{c2}}(0~\text{K})$ quasi-2D band observed quantum oscillations. Our results indicate contributes superconductivity CaSb$_2$.