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In this work we study the semi-leptonic decay of $\bar{B}_s^0\to \phi l^+l^-$($l=e, \mu, \tau$) with QCD sum rule method. We calculate the$\bar{B}_s^0\to \phi$ translation form factors relevant to this semi-leptonicdecay, then the branching ratios of $\bar{B}_s^0\to \phi l^+ l^-$($l=e, \mu,\tau$) decays are calculated with the form factors obtained here. Our resultfor the branching ratio of $\bar{B}_s^0\to \phi\mu^+ \mu^-$ agrees very wellwith the recent experimental data. For the unmeasured decay modes such as$\bar{B}_s^0\to \phi e^+ e^-$ and $\bar{B}_s^0\to \phi\tau^+ \tau^-$, we givetheoretical predictions.

Study of semileptonic decay of $\bar{B}_s^0\to \phi l^+ l^-$ in QCD sum rule