Possible two-component spin-singlet pairings in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>Sr</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi>RuO</mml:mi></mml:mrow><mml:mn>4</mml:mn></mml:msub></mml:math>

Recent experiments suggest a multi-component pairing function in Sr2RuO4, which appears to be inconsistent with the absence of an apparent cusp transition temperature (Tc) as uniaxial strain. We show, however, that theoretical Tc for can easily smeared out by spatial inhomogeneity strain, and experimental data reproduced qualitatively percolation model. This shed new light on pairings. then perform thorough group-theoretical classification functions, taking spin-orbit coupling into account. list all 13 types two-component spin-singlet 8 them belonging Eg representation. In particular, we find two intra-orbital pairings representation ($k_xk_z$, $k_yk_z$) are favorable view most existing experiments.