Abstract: Lead magnesium niobate ceramics have been synthesised by wet chemical method and their microstructures are studied by means of X-ray diffraction(XRD,scanning electron microscopy(SEM) and transndssion electron microscopy(TEM). The experimental results show that pure perovskite PMN ceramics is obtained during calcining at 800℃ for 1h. The grain size of PMN ceramic varies from 150nm to 200nm after sintering at 85O~ 920 ℃. The pyrochlore phase is situated at the grain boundaries of the perovskite phase if it occurs. Excess PbO phase existing in the ceramic is in favour of sintering of the cerarnic powder.