用偏最小二乘（ＰＬＳ）示波极谱法对在次甲基蓝－草酸底液中的铟、锡两组分同时测定进行了研究，并着重讨论了特征变量数及电流采样点数对预报结果的影响。与已有文献方法相比，本法具有两组分相对允许浓度范围宽的显著优点。本法还成功地用于实际样品铝合金中铟和锡的同时测定，其回收率在９８．０％～１０９．０％之间。 The partial least squares (PLS) oscillopolarographic method was used to study the simultaneous determination of indium and tin in the methylene blue-oxalic acid bottom solution. The characteristics variables and current sampling points were also discussed. Effect of the result. Compared with the existing literature methods, this method has the obvious advantages of relatively wide range of allowable concentration of the two components. This method has also been successfully used for the simultaneous determination of indium and tin in the actual samples of aluminum alloys, the recovery rate of 98.0% ~ 109.0%.