Using MgC3·Mg (OH)2·4H2O instead of MgO, the pure columbite phase is synthesized at 1100oC for 6 hrs, consequently the formation of pyrochlore phase is avoided in the second step calcinations process. Using (PbCO3)2· Pb (OH2 instead of PbO, the X - ray diffraction analysis is investigated for the precursor powders calcined at 650 - 1150oC for 2 hrs, the result shows that the main phase composition of the precursor powders is perovskite PMN -PT, and the PMN - PT solid solutions are continuously formed with the calcined temperature elevation, at the same time the tetragonal PbO phase is transformed in orthogonal PbO phase, whereas the pyrochlore phase does not arise in all calcined powders. Therefore, this synthesis technology of PMN - PT using (PbCO3)2·Pb (OH)2 is especially adapted to the condition of low temperature sintering of PMN -PT ceramics by using excess PbO as sintering aids.