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Four low-energy complex isomers were predicted, among which the global minimum was experimentally identified through agreement between theoretical and measured rotational constants. The phenyl substituent was found to introduce additional non-covalent interactions beyond the typical CCO2\u22efO tetrel bond, including secondary C\u22efOCO2 tetrel bond and C\u2013H\u22efOCO2 weak hydrogen bond, which collectively stabilized the complex and distorted the epoxide ring. Further \u03c0-electron localization and natural orbital for chemical valence analyses revealed that the phenyl ring modulated local electron density, while comparative calculations of binding energy further indicate that the synergistic weak interactions between styrene oxide and CO2 contribute to enhancing the structural stability of the styrene oxide\u2013CO2 complex. 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