Abstract: YMnO3 nano-powders were prepared by calcining the precursors,which were synthesized via microwave-assisted low-temperature solid state reaction using metal inorganic salts as raw materials and citric acid as complexant,to study the influences of calcination temperature and microwave power on the products.The results show that Y and Mn elements in the precursors were blended at the atom level by using microwave-assisted low-temperature solid state reaction.Hexagonal YMnO3 phase were mainly synthesized through calcining the precursors at 800 ℃ for 3 h.The impurity phases of Y2O3 and YMn2O5 were detected in the products when the calcination temperature rose to 900 ℃ and 1 000 ℃.The hexagonal high purity YMnO3 phase can be synthesized at 1 100 ℃,but serious aggregation of powders was found.Using microwave-assisted low-temperature solid state reaction and calcination at 800 ℃ can obtain the YMnO3 nano-powders whose particle size was more uniform and sphericity was better,compared with the traditional low-temperature solid state reaction.