We applied the cold sintering process to a Li13.9Sr0.1Zn(GeO4) lithium ionic conduction material. The incongruent dissolution in water was so aggressive, it decomposed the crystalline LSZG phase to a glassy phase, and the glassy phase densified under the CSP conditions. An annealing was effective for recrystallization with annealing at 800℃ for 5 h. The electrical properties show that the annealing after the cold sintering could produce materials with high lithium ion conductivity of 3.0 × 10−2 S/cm at 400℃ and is a similar property to that of a conventionally sintered sample, at 1150℃.