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We study the charmonium 2S states $\psi'$ and $\eta_c'$, and the bottomonium2S states $\Upsilon'$ and $\eta_b'$, using the light-front quark model and the2S state wave function of harmonic oscillator as the approximation of the 2Squarkonium wave function. The decay constants, transition form factors andmasses of these mesons are calculated and compared with experimental data.Predictions of quantities such as Br$(\psi' \to \gamma \eta_c')$ are made. The2S wave function may help us learn more about the structure of these heavyquarkonia.

Heavy quarkonium 2S states in light-front quark model