  In the simple color-magnetic interaction model, we investigate possible
ground $cs\bar{c}\bar{s}$ tetraquark states in the diquark-antidiquark basis.
We use several methods to estimate the mass spectrum and discuss possible
assignment for the $X$ states observed in the $J/\psi\phi$ channel. We find
that assigning the Belle $X(4350)$ as a $0^{++}$ tetraquark is consistent with
the tetraquark interpretation for the $X(4140)$ and $X(4270)$ while the
interpretation of the $X(4500)$ and $X(4700)$ needs orbital or radial
excitation. There probably exist several tetraquarks around 4.3 GeV that decay
into $J/\psi\phi$ or $\eta_c\phi$.
