A new method was proposed to prepare the ceramics with doping rare metal element,e.g.the microcrystalline powder with doping rare metal element was first fabricated, and then the ceramics was prepared by using these powders as raw materials. In this paper, the effects of Bi2O3 content on the morphology of KSr2Nb5O15 microcrystal and microstructure of KSr2Nb5O15 ceramics were investigated by this way.The experimental results suggested that the KSr2Nb5O15 microcrystal with doping Bi was fabricated by Bi3+ entering the KSr2Nb5O15 crystal lattice.The dopant of Bi element into KSr2Nb5O15 ceramics caused the reduction of grain boundary energy anisotropy and inhibition of abnormal grain growth.