SOFCs can convert chemical energy directly to electric energy efficiently with minimum emissions. Unfortunately, the existing SOFC technologies are still too expensive for commercial use due to the high operating temperature. A critical step toward low-cost SOFC technologies is to develop materials with high conductivity of oxygen ions or protons (O2- or H+) at lower temperatures. Li+ in some lithium ion conductors can be replaced by H+ through a reversible ion-exchange (even just in water solution), implying that it is possible to turn a lithium-ion conductor to a proton conductor by H+/Li+ exchange. Here we demonstrate that Li14Zn(GeO4)4 (LZG) exhibits not only lithium ion (for LIBs) but also protons (for SOFCs). In order to elucidate the mechanism of Li+ and H+ conduction in LSZG electrolyte, abinitio molecular dynamics computation was used to investigate Li+ and H+ transport trajectories，the diffusivity and the electronic density of states (e-DOS) for each type of ions in Li14Zn(GeO4)4. And in turn, the obtained calculating data can guide future design for 200~600 ℃ based proton conductor.