Abstract: The La2Zr2O7 powders with pyrochlore structure were synthesized by the molten salt method with zirconium oxide and lanthanum oxide as reaction materials and with potassium chloride and lithium chloride as reaction media. The influences of reaction temperatures and molten salt content on the powder purity were investigated and the microstructures of the prepared powders was analyzed. The results show that apart from that directly prepared by the reaction materials, the La2Zr2O7 powders were also synthesized by the reaction of ZrO2 powder with intermediate product of LaOCl produced by the reaction of La2O3 powder with molten salts. The production of La2Zr2O7 phase increased with the increase of the reaction temperature and first increased then decreased with the molten salt content increase. Pure La2Zr2O7 powder was obtained under the condition of reaction at 1 200 ℃ for 3 h with the mass ratio of molten salt to reaction material of 3∶1. The morphology of the prepared La2Zr2O7 powder was similar to that of raw material ZrO2 powder, showing an irregular particle shape with grain sizes of 80-200 nm.