Li0.2375+xLa0.5875-xSrxTiO3-LaPO4 fast ionic conductor was synthesized by high temperature solid state reaction. A.C. impedance measurements show that the system has higher conductivity in low doping content of Sr2+, but the conductivity goes down from 5.78×10-5 to 3.11×10-7 S·cm-1 with increasing the content of Sr2+. The activation energy is about 20 kJ·mol-1 in the temperature range of 25～400 ℃. X-ray powder diffraction shows that the doping Sr2+ would not affect the structure of compositions in the system. The main phase is Li0.2375+xLa0.5875-xSrxTiO3 perovskite solid solution, LaPO4 as a second phase can also be found. With increasing the content of Sr2+ （x>0.05）, another phase SrTiO3 appears. IR measurement also indicates that the structure of compositions in the system would not be affected by Sr2+ doping. The decomposition voltage of Li0.2375+xLa0.5875-xSrxTiO3-LaPO4 remain unchanged （1.5 V）.
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