Li0.24+2xLa0.59-xMxTiO3-LaPO4 （M=K, Na） fast ionic conductor was synthesized by high temperature solid state reaction. A.C. Impedance measurements show that the compositions of system have better conductivities in low doping content of Na+ and K+, as the doping content increases, the conductivity goes down in Na+ doping system. But in doping K+ system, the conductivity goes down and then goes up with the increasing content of K+. The activation energies of different doped ions are about 20 kJ·mol-1 in the temperature range of 25～400 ℃. X-ray powder diffraction shows that the doped Na+ and K+ would not affect the structure of compositions in the system. The main phase is Li0.24+2xLa0.59-xMxTiO3 perovskite solid solution, LaPO4 as a second phase also can be found. With increasing the content of M （x>004）, unknown phase appears. IR measurement also indicates that the structure of compositions in the system would not be affected by doping alkali ion.
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