Based On the derived random state model of river water quality syst-em,Tamura filter was presented to estimate BOD concentration only using DO concentration,which can be measured immediately.

• 本文基于导出的河流水质系统随机状态空间模型，提出了以能够即时测定的DO浓度实时估计不易测定的BOD浓度的塔穆勒滤波方法。