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Motivated by the finding of nearly isotropic superconductivity in$\mathrm{(Ba,K)Fe_2As_2}$, we use renormalized mean field theory toinvestigated the $t$-$J$ model on three-dimensional simple cubic lattice. Atunable anisotropic parameter is introduced to dictate the coupling on $z$direction. The symmetry of the superconducting order is studied in detail.Calculation shows that for the isotropic case, pairing parameters on the threeperpendicular directions have ${2/3}\pi$ phase shift to each other. However,when the interaction on $z$ direction is suppressed, the correspondingamplitude of the pairing parameter decreases rapidly, furthermore,two-dimensional d-wave state pairing is favored when the anisotropic rate lessthan 0.75.

Superconducting symmetry of three-dimensional $t$-$J$ model on simple cubic lattice