用水热方法以ＴｉＯ＿２为钛源，ＢａＣｌ＿２为钡源，合成粉体ＢａＴｉＯ＿３，并采用后处理方式除去Ｂａ－ＴｉＯ＿３中的杂相ＢａＣＯ＿３。通过ＸＲＤ粉末衍射分析了杂相的存在及除去，用扫描电子显微镜（ＳＥＭ）对未经处理和处理后的ＢａＴｉＯ＿３样品表面进行了观察。与反应前往体系中通入Ｎ＿２的方法相比，对ＢａＴｉＯ＿３样品进行后处理的方法具有操作方便、除杂效果好的优点。 By hydrothermal method, TiO 2 was used as titanium source and BaCl 2 was used as barium source to synthesize BaTiO_3 powder, and BaCO_3 was removed by post-treatment in Ba-TiO_3. The existence and removal of heterogeneous phases were analyzed by XRD, and the surface of BaTiO_3 samples was observed by scanning electron microscopy (SEM). Compared with the method of passing N_2 into the reaction system, the method of post-treating BaTiO_3 sample has the advantages of convenient operation and good impurity removal effect.