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Sulfide-based Na-ion solid electrolytes with high ionic conductivity are one of the most promising solid electrolytes for solid-state Na batteries. However, its poor chemical/electrochemical stability against Na metal leads to deterioration of interface. In addition, it is important to explore how to prepare sulfide-based composite membranes via solution method. Herein, Na 3 SbS 4 is deposited on glassfiber framework via aqueous solution and further incorporated with trace of ionic liquid (IL). The Na 3 SbS 4 composite pellets are well shaped avoiding the pressing process. The IL not only improves the Na 3 SbS 4-Na interfacial stability, but also fills the pores between the framework and Na 3 SbS 4 and thereby suppressing the dendrite formation. The Na plating/stripping tests on symmetric cells show polarization voltages lower than 0.1 V and stable cycling for more than 400 cycles under a current density of 0.1 mA cm-2 at room temperature. The cycling performance of the FeS 2 half-cells with the optimized electrolyte tested at 60°C is superior to that with organic liquid electrolyte.